Hey i was wondering of a 60 mm exhaust piping would be ok for a 10psi boosted LS. I saw a couple of cars running over 250 whp with a 2.25. Im trying to go with a sleeper look and a lil bit quiet. 60mm is about 2.36 isnt it?

 

Yes, 2.36 in. I have a 60 mm exhaust on my DA (Tanabe Hyper Medallion). I'm running 9 psi now, but haven't dynoed her yet. The whp in my sig was on 6.5 psi. If you're looking for quiet, this muffler is perfect. I get nothing but compliments for it's mellow deep note. As far as sleeper-looking it's a little on the blingy side, but it's not too bad.

 

I have seen people make good numbers with 2.5" but if you want to make ral power it needs to be a full 76mm.