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Old 08-18-2008, 08:22 PM
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Lost Power

To start , I'm working on a 1970 pontiac trans am, 400eng/4spd. 355posi rear, everything seem's good till i decide to take the starting to "rusting off " 2"aluminized exhaust with glass pack's and replace them with the "PYPES PERFORMANCE X SYSTEM 2 1/2" stainless setup. I've also got headman header's that were on the car with the old system. The prolem is there's a very noticable power loss with the new system on the car. The mufflers that came with the system I was told by the seller that i should be noticing a power gain if anything, Any body have idea's??

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Old 08-18-2008, 09:29 PM
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Jetted to lean?
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Old 08-19-2008, 09:09 AM
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Yeah, I agree you might have a jetting problem.....different backpressure now than before.

Just an idea...could it possibly be that the car is running as good, but "feels" slower now, because it's quieter and possibly smoother?
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Old 08-23-2008, 04:13 AM
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Is your coolant been loosing? Too much air wouldn't lead to a loss of power. Plugs shouldn't all of a sudden cause a drop in power so doubtful it's that simple.

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