Will an 88 convertible muffler fit and go with an S5 Turbo?

 

It will fit but I think that the turbo mufflers flow more due to the larger piping. Might get you through in a pinch though. This is stock though. As far as aftermarket I think all the single are meant for turbos. Racing Beat's mufflers for their turbo catback( not the Rev 2 turbo complete system as that whole system has larger piping) have a larger core size as well but just like stock the n/a mufflers will bolt right up.

 

^^What he said - it'd do in a pinch, but it's going to cost you power. The NA mufflers are more restrictive, both because of smaller plumbing commensurate with an engine that moves less air, and because the NA mufflers have to damp the harsher NA exhaust noise more to keep things civilized - the turbo absorbs a lot of the TII exhaust pulses. I'd consider straight-pipe from the Y outlets before I'd over muffle it, if it were my car.

 

Yeah I read up on it. Need turbo ii oem set up