Join Date: Jun 2000
Location: Winston Salem, NC
gtrout, the ProChamber doesn't have cats.
It could just be engine noise coming through that was previously blocked by cats. I notice much of the same thing with my off road H Pipe. And at around 2000rpm, before it gets real loud, I hear a hissing I thought was a leak, but is actually just the air rushing through the pipes and crossover tube.
SamP- BSME -
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~1998 GT~ SALEEN Ground Effects, Cobra R wheels (17x10.5 rear, 17x8 front), MAC OR H-Pipe, FMS C Springs
"You tried, and you failed miserably. The moral of the story - never try."