I have an old Aero silencer laying around in my garage which I can take a look at if you would like...
Thanks, but I doubt the internal design is the same as the side pipe exhaust.
Not so sure on that... however.. I'll take a look at a side piped car at our next meet.
The side pipe has a very distinctive flatulent sound(almost sounded like a Harley Davidson) whereas the rear sport pipe would sound like a...err...V8rumbling/TVR like

Therefore I believe the internal design would be different to that of the conventional rear...
Heres some pics I've took of my side pipe:
This pic shows the inlet into the silencer..Pipe diameter approx 2 1/4"

This one shows the outlet, note the 90degree bend is approx only 1" in dia. and I don't think its straight thru design


Looks like the cheapest way is to sleeved the inlet with non venting tube

Would you be able to design a side pipe which would give me that extra v8 rumble when idling...draw it on a paper and post it?
Indeed.. less perforation. This allows more of the exhaust pulse to exit the exhaust intact (ie not diffused). However without matching the diameter you end up with more of a bark than a deep woofle.
thanks for the explanation, otherwise would have no idea what it does to the sound
