Click here to enlarge Originally Posted by Prowsey Click here to enlarge
dunno im used to loud cars after 3 ss utes and wouldnt mind a bit off a growl from the sri i would use the same diameter pipe that opel used just delete the rear muffler.
I have a full Milltek system on my VXR and just a Lukey rear muffler on my Sri T, the Milltek is a more refined system but a Remus or Lukey muffler may give you what you desire.

P.S
I like and have owned the old school V8`s and straight 6`s so I know where you are coming from !