Auto Racing: 2.5 or 3 muffler?, subaru wrx, speedvision cup

Question
Dan,

I've got a 2002 Subaru WRX and I'm looking into getting a cat-back muffler, specifically Stromung. They offer a 2.5" and 3" pipe. Someone had told me once that you have to be careful about sizing the pipe because of the "scavenging" effect of the gases. If the pipe is too large you may lose low-end power. The car already has very little low end because of the low compression so I don't want to lose anymore. I'm not planning on anymore mods to the car. Which size would you recommend?

Thanks,

Mike

Answer
Hi Mike:

Definately stay with the smaller pipe, the 3" looks great and will impress your buds, but it will steal low end torque.  

I Love that little car !  My friend Irish Mike Flynn in Orlando is fielding a pro team for the Speedvision Cup (I think) with Steve Piantineri as one of the drivers. I've probably been in 50 races with Steve, and he's a pleasure to compete with, and against.

Good luck with your Subie !

Dan Liddy
Sarasota Florida