Headers and mufflers for street & track

[raacer]

going thru an engine rebuild now.
Looking for header and mufflers. Idrive the car daily in reasonable weather. Must pass stringent New Jersey emissions.but the cats could be removable for the track. Must watch db level for Lime Rock Park. Any suggestions B&B,GHL,Fabspeed??? Resonance an issue...

[pbs911]

Welcome to the board.

I have B&B headers with the Fabspeed muffler. Fabspeed claims it will pass the strict sound level at Lime Rock with the B&B headers. Running dual out, however, I find it difficult to believe. The resonance is also bad from 2800-3200 RPMS. The good thing about Fabspeed is you can cap off one outlet to get rid of the resonance and quiet it down. That's how I run mine and it has a very nice soiund level for daily driving. I believe the Fabspeed muffler is actually the Flowmaster.

I have heard that you can cut about 1.5 inches off at the flange, and have the flanges welded back on, for the B&B to help with the resonance. The problem is with a header dual out system you will have some degree of resonance.

I know of no headers that provide any beneficial HP/torque increases that run the cats (GHL, cough). It's probably best to switch the exhaust for emissions testing and go with a good header such as B&B or S-Car-Go that will provide an increase in performance. Hope this helps.