***Completed*** Scorpion Exhausts - E85/86 - 2.5si and 3.0si Exhaust System Development!
- Thread starter nfbr
- Start date
:happyclap:
looking good! cant wait to hear her
looking good! cant wait to hear her
mr wilks said:
Changing just the tailpipes does nothing other than improve the looks. (And even that's questionable on some that I've seen)
Replacing the back box on its own will improve the sound slightly, but generally won't do anything for performance. A poorly made custom rear silencer could even cause a slight loss in performance, trust me I've seen horrific stuff from a couple of the popular custom exhaust franchises whilst working in this industry.
A half system, or catback system does away with everything after the cats, where most cars have compression bent pipe work (meaning the diameter reduces at the bends). Removing these compression bends and using mandrel bends slightly improves flow and can improve both the sound and the throttle response.
That and the benefits of stainless steel over mild steel.
The BMW pipe work is actually a fair bit better than most manufacturers. I've seen a lot of VAG stuff with what looks like a crushed Toblerone where it runs through the rear subframe.
For me, it would only ever be a full system or a half system. I wouldn't do a cat-back because I'm fussy and like to go for the very best that I can afford when replacing parts. If I had the money, I'd be taking the car to a guy I know who does race manifolds for a pair of exhaust manifolds and high flow cats, but then I'm just a young 'un in a low paying job with bills to pay, so that'll be a dream for the future.
On a similar topic, my colleague with the E46 M3 had the Scorpion rear silencer only at first on his car and it sounded good, however it sounded even better when he decided to add the matching centre section. Throttle response felt slightly better too, but not quite as much as it did when we did the valve shims.
There are absolutely no negatives to going for a catback system over a rear silencer IMO
Flyingfifer said:
Thanks fella.
Cheers , only asked as OEM BMW exhaust pipe is generally decent quality work & many who want a exhaust mod are only after a more purposeful tone & a change of tips from stock offerings :? plus costs are also a big factor hence my wondering why not just change the backbox/tips
Any ideas on costs at this point ?
Any ideas on costs at this point ?
mr wilks said:
Just look at the quality and Fitment of some of the cheap custom rear silencers a few people have had done on here versus these development stage pics and you'll see the difference immediately. On a premium car like this I wouldn't be paying a "custom exhaust specialist" who doesn't understand he fundamentals of the exhaust system to "knock something up in a couple of hours". It'd be like wearing a Versace suit with flip flops and socks
I don't know about the price as of yet I'm afraid, but this will be something that Scorpion will work out based on their raw cost per system.
It certainly won't be Akrapovič money that's for sure
Bmwjay said:
The development work isn't even finished yet. The guys at Scorpion will be deciding on the price once all the development is finished and cost factors are calculated.
As soon as I know the price, this will be the first place that the price gets posted
Regards, Al.
nfbr said:Bmwjay said:
The development work isn't even finished yet. The guys at Scorpion will be deciding on the price once all the development is finished and cost factors are calculated.
As soon as I know the price, this will be the first place that the price gets posted
Regards, Al.
+1
This wont be a 2 or 3 day job I wasn't even expecting it to progress as fast as it has!
aper:
So we have a little bit of news...
It's looking likely that I'll have the car back either before or on the weekend. I don't have much in the way of Video/Audio recording equipment other than my iPhone, which I'm certain won't do the sound any real justice, so if anyone in the Manchester Area is able to help out with getting some sound samples and or videos, it would be greatly appreciated.
Regards, Al.
Shaun Jackson - Engineering @ Scorpion Exhausts said:
It's looking likely that I'll have the car back either before or on the weekend. I don't have much in the way of Video/Audio recording equipment other than my iPhone, which I'm certain won't do the sound any real justice, so if anyone in the Manchester Area is able to help out with getting some sound samples and or videos, it would be greatly appreciated.
Regards, Al.
I'll find out a bit more tomorrow, but as I've often say, it's not realistic to expect a decent measurable performance gain from a Cat Back exhaust on a naturally aspirated.
This is why they tend to power test before and after, but keep the figures to themselves.
This is why they tend to power test before and after, but keep the figures to themselves.
