Mid pipe cats replaced - question

V

Verinder1984

Member
Hi guys I’m booking my car in to have the mid pipe cats removed and replaced with sports cats.

Main reason for the mod is the make the car a little louder whilst retaining stock look.

Wanted to know if I do this mod will it bring up any errors on the dash? If so what can be done to fix the errors?

Many thanks in advance
 
Spoke the the exhaust guy he convinced me to just do a 2nd cat delete.

Cheaper, and said it won’t make the car too loud Bcus the rest of the exhaust is stock. And said will pass mot no issues.
I’m not so sure but I hope he know what he’s talking about.

If it’s loud I can always reverse it
 
Verinder1984 said:
Spoke the the exhaust guy he convinced me to just do a 2nd cat delete.

Cheaper, and said it won’t make the car too loud Bcus the rest of the exhaust is stock. And said will pass mot no issues.
I’m not so sure but I hope he know what he’s talking about.

If it’s loud I can always reverse it
Click to expand...

Are you in the UK? Our cars only have 1 set of cats... So it won't pass an mot no...
 
RedUn said:
Verinder1984 said:
Spoke the the exhaust guy he convinced me to just do a 2nd cat delete.

Cheaper, and said it won’t make the car too loud Bcus the rest of the exhaust is stock. And said will pass mot no issues.
I’m not so sure but I hope he know what he’s talking about.

If it’s loud I can always reverse it
Click to expand...

Are you in the UK? Our cars only have 1 set of cats... So it won't pass an mot no...
Click to expand...


Yes uk z4mr. Hummmm. I think I can fix emissions issue with mot not overly worried. Will it flare up any errors on dash? And with induction would you say it worth remapping.

I noticed with only induction it has flat spots between 1-2k rpm sometimes.
 
Verinder1984 said:
RedUn said:
Verinder1984 said:
Spoke the the exhaust guy he convinced me to just do a 2nd cat delete.

Cheaper, and said it won’t make the car too loud Bcus the rest of the exhaust is stock. And said will pass mot no issues.
I’m not so sure but I hope he know what he’s talking about.

If it’s loud I can always reverse it
Click to expand...

Are you in the UK? Our cars only have 1 set of cats... So it won't pass an mot no...
Click to expand...


Yes uk z4mr. Hummmm. I think I can fix emissions issue with mot not overly worried. Will it flare up any errors on dash? And with induction would you say it worth remapping.

I noticed with only induction it has flat spots between 1-2k rpm sometimes.
Click to expand...

You sure he means the Cats and not the centre x pipe part / resonator? Seen that 'straight' piped before which will give a bit more sound and not cause any issues. Straight up cat delete seems risky these days...not sure how you'll pass an MOT as emissions is all electronically done and recorded isn't it (as in the tester can't just overlook it...)?

You'll need to program out the post cat 02 sensors or you will get an error code I would think.

Can't help with the flat spot but not sure why'd be in that rev range anyway. Putting a lot of load / stress on the engine down in that range potentially, keep it 2k and above would be my advice and if it's fine from there up to the limiter I wouldn't worry about it, it's not a diesel :wink:
See if you are throwing any codes would be my only suggestion if it really bothers you but not unknown for some induction kits to cause some minor running issues on these.
 
MOT man should visually check for the presence of factory fitted emission control devices. I suspect they are only going to get more strict on this one.
 
Your right it’s a you’re bypass going in today in an hour.

Will let yall know how I feel about it.



AndyBeech said:
Verinder1984 said:
RedUn said:
Are you in the UK? Our cars only have 1 set of cats... So it won't pass an mot no...
Click to expand...


Yes uk z4mr. Hummmm. I think I can fix emissions issue with mot not overly worried. Will it flare up any errors on dash? And with induction would you say it worth remapping.

I noticed with only induction it has flat spots between 1-2k rpm sometimes.
Click to expand...

You sure he means the Cats and not the centre x pipe part / resonator? Seen that 'straight' piped before which will give a bit more sound and not cause any issues. Straight up cat delete seems risky these days...not sure how you'll pass an MOT as emissions is all electronically done and recorded isn't it (as in the tester can't just overlook it...)?

You'll need to program out the post cat 02 sensors or you will get an error code I would think.

Can't help with the flat spot but not sure why'd be in that rev range anyway. Putting a lot of load / stress on the engine down in that range potentially, keep it 2k and above would be my advice and if it's fine from there up to the limiter I wouldn't worry about it, it's not a diesel :wink:
See if you are throwing any codes would be my only suggestion if it really bothers you but not unknown for some induction kits to cause some minor running issues on these.
Click to expand...
 
Full waste of time. Got to the fabricators who said unless u change the cats or back box there’s nothing that can be done.

Bypassing the xpipe wouldn’t increase the sound as the car doesn’t have secondary cats.

Lollllllllllllll waste of 3h
 
Yes, waste of time, just delete the backboxes if you need something LOUD...
Also the cats don't sip much power but do actual magic wonders to all the toxic stuff that we'd otherwise get.
 
Verinder1984 said:
Full waste of time. Got to the fabricators who said unless u change the cats or back box there’s nothing that can be done.

Bypassing the xpipe wouldn’t increase the sound as the car doesn’t have secondary cats.

Lollllllllllllll waste of 3h
Click to expand...
Hmm clearly doesn't have a clue.

The oem x pipe has a resonator, people have replaced with a non resonated x pipe such as the rogue version with the oem back boxes for a nice but not mental volume increase.

Secondary cats has nothing to do with it.

You could do both the cats and the x pipe but if imagine it would be quite raspy with the oem rear boxes.
 
So it looks like you'll need to go with aftermarket back-boxes if you want a bit more volume.

RPI and Eisman spring to mind, although a previous owner had Powerflow ones fitted to my car and I've been really pleased with them.

A back-box delete might be a bit too much volume, and if there is any chance you might do a track day you'd probably exceed noise limits!
 
I'll be removing my supersprint x-pipe soon (installed earlier this year) as it has made the car too loud for most tracks with the ss race back boxes I have, drop me a msg if interested. I need a bit of time though to figure out how best to repair the damage to the oe flanges I made on removal :headbang:
It's a surprising difference in volume compared to stock (at least with the back boxes I have), more of a burble on idle and deeper tone all round.
 
TomK said:
I'll be removing my supersprint x-pipe soon (installed earlier this year) as it has made the car too loud for most tracks with the ss race back boxes I have, drop me a msg if interested. I need a bit of time though to figure out how best to repair the damage to the oe flanges I made on removal :headbang:
It's a surprising difference in volume compared to stock (at least with the back boxes I have), more of a burble on idle and deeper tone all round.
Click to expand...

I was running SS V1 headers, cat'd s-pipe, x-pipe and Powerloop back boxes for a few months and recently went back to the stock x-pipe. Volume, drone, burbles/pops and rasp all decreased and overall the exhaust sounds flatter. On balance, the stock x-pipe is better for me but I did enjoy that hollow, metallic sounding howl with the Supersprint item.
 
///MBan said:
I was running SS V1 headers, cat'd s-pipe, x-pipe and Powerloop back boxes for a few months and recently went back to the stock x-pipe. Volume, drone, burbles/pops and rasp all decreased and overall the exhaust sounds flatter. On balance, the stock x-pipe is better for me but I did enjoy that hollow, metallic sounding howl with the Supersprint item.
Click to expand...
Likewise, I enjoyed the sound, but it has pushed things too far over the edge both in terms of circuit limits and just being a bit cringe loud.
I have the option to go to powerloop which I would suspect cure the noise limit problem, but it's extra cost and extra weight so I'm just going to go back to the oe x-pipe and keep the race cans, it was fine like that before :oops:
I think it would be an interesting mod for someone with OE back boxes.
 
Interesting to know that’s what’s I was after in the first place.

I might just leave it now seems to be too much headache.

I wouldn’t mind sports cats.. I’ll make some calls Monday. If anyone knows a place that can do sports cats at a good price for the zed in Berkshire, bucks, Surrey Let me know.

I think I like the tinny thrashy sound. So sport cats should amplify that.
RedUn said:
Verinder1984 said:
Full waste of time. Got to the fabricators who said unless u change the cats or back box there’s nothing that can be done.

Bypassing the xpipe wouldn’t increase the sound as the car doesn’t have secondary cats.

Lollllllllllllll waste of 3h
Click to expand...
Hmm clearly doesn't have a clue.

The oem x pipe has a resonator, people have replaced with a non resonated x pipe such as the rogue version with the oem back boxes for a nice but not mental volume increase.

Secondary cats has nothing to do with it.

You could do both the cats and the x pipe but if imagine it would be quite raspy with the oem rear boxes.
Click to expand...
 
Verinder1984 said:
Interesting to know that’s what’s I was after in the first place.

I might just leave it now seems to be too much headache.

I wouldn’t mind sports cats.. I’ll make some calls Monday. If anyone knows a place that can do sports cats at a good price for the zed in Berkshire, bucks, Surrey Let me know.

I think I like the tinny thrashy sound. So sport cats should amplify that.
RedUn said:
Verinder1984 said:
Full waste of time. Got to the fabricators who said unless u change the cats or back box there’s nothing that can be done.

Bypassing the xpipe wouldn’t increase the sound as the car doesn’t have secondary cats.

Lollllllllllllll waste of 3h
Click to expand...
Hmm clearly doesn't have a clue.

The oem x pipe has a resonator, people have replaced with a non resonated x pipe such as the rogue version with the oem back boxes for a nice but not mental volume increase.

Secondary cats has nothing to do with it.

You could do both the cats and the x pipe but if imagine it would be quite raspy with the oem rear boxes.
Click to expand...
Click to expand...
Buy a bolt on setup, rogue x pipe and supersprint decats, all bolt in, you can change it easily then if you like it or want to do more at a later :thumbsup:
 
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