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#1
01-28-2026, 03:17 PM
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Pypes Race Pro muffler replacement
Hi,
I have the Pypes SGF70 exhaust system with the Pypes Race Pro muffler on my 68 firebird. It is a straight through muffler (dual input/output with 1 input coming in top left, with top right exit, 1 input coming in bottom left with bottom right exit). Unfortunately, the Race pro muffler produces a resonance at idle RPM that is driving me crazy (higher RPM sounds good). I would like to replace it with a Dynomax or Magnaflow mufflers but the only ones I came across have a built in X-pipe inside the muffler. Can I use one of these with this setup? If not any recommendations on what I could use? Magnaflow 11386 https://www.summitracing.com/parts/m...SmLM3dB6moHM1V Dynomax 17553 https://www.summitracing.com/parts/w...HbhqauxXFQleJv
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1966 Lemans convertible 455/5spd 1968 Firebird convertible 400/4spd Need more Pontiacs! |
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