It sounds like some of us have the same problem. Mine is definitely some sort of air/exhaust pop. It's not a hard mechanical part thump.
It doesn't happen at high rpms. It sounds like B2r3y's description, but it's air. I'll check the timing. I think it's set at stock. I hadn't bumped it up to 14 or anything yet.
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94GT 5spd Coupe
1/4 = 13.6@103
60ft = 2.0315 on Michelin Pilots
GT 40 Intake
GT 40Y Aluminum heads
1.7 rockers, BBK Cold air
Fluidyne, BBK long tubes & H-Pipe
65mm TB
Al Driveshaft
Hurst Shifter
Cobra R hood
HPM Subframes
Control Arms
Future mods = Procharger and/or 331/347 Stroker, Turbo?
Rice Haters Club Member #77
FOR SALE:
Strut Tower Brace $30
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