Aftermarket Rear Box advice

M

mason storm

Active member
I'm considering changing the back box on my Coupe, currently I have the bypass mod which adds a bit more sound but still seems a bit subdued especially at the very top end.

Has anyone changed their back box and been happy with it, I don't want the drone noise on the motorway so I'm more after a subtle noise low down but nice top end bark.

I know powerflow do back boxes and there's a fitter near me has anyone tried one of their back boss? I know they offer a few options
 
danmiddle2 said:
When you say the bypass mod - do you mean this? http://z4-forum.com/forum/viewtopic.php?f=9&t=52845
Click to expand...

No although that looks interesting

It's the one where two pipes channel some of the exhaust gasses round the back box
 
I am going to give it a go on my 3.0si... just thought you might have tried that already.

I can post details about how I get on, if helpful.
 
Imo powerflow seem hit and miss as they are franchised so you'll have to go by experience/ reputation of your local one.

Other option is to go with a quad too :fuelfire:


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