ive got an open wastegate on my car and while ive heard its best for flow, it is pretty loud on WOT runs. ive heard/read that plumbing back into the exhaust quiers them, but disturbs the exhaust flow, which can be detrimental for max power.

would running 2 separate pipes, 1 from the turbo and 1 from the waste gate and joining them towards the rear, with either a 2 to 1 muffler or a y pipe, be beneficial at all in the ever growing "noise vs power vs weight" issue?

 

It is a viable option. I know that aftermarket exhausts for Porsche 930s (turbo 911s from the 70s/80s) ran the wastegate directly to a separate muffler and tailpipe. Works great, and still sounds mean as hell when you are on boost.

-Stew

 

I am in same boat- a little loud for Auto-x w/ open WG.

In the interst of simplicity and weight I am going to try a shorty muffler that still exits under the car w/ a turn down. I know ANY muffler really helps on the open header cars, so I imagine it will help us. Under car is fine as anytime the WG is open you are moving... fast.

Under the car is a low pressure area and if you get the turn down parallel to grond and pretty close it is even more low pressure as you get high velocity flow over tip. Put a cut back on the rear of turn down for the right shape for vaccuum.

I actually had a pipe/muffler made to do the above when I had the stock wastegate open air vented- dropped the boost creep at high speeds w/ the pipe on VS no pipe. Worse boost creep at low speeds though because of the muffler restriction on WG. I had another short pipe made w/ no muffler- helped boost creep even more at high speeds and same as no pipe at low speeds.

They make really small Supertraps and I have heard what a difference even those make, but I am thinking inline flow straight through like a little 12" long 2.5" Borla XR-1 (60mm WG).