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98LS1

Did he dyno it or just going by feel? Did you perhaps loose a bolt when putting on said exhaust? Could said bolt be under the gas pedal?

SilverGTV8

Strange I have heard flowmasters have caused powerloss before. Hmmmm...I wonder if it really is true.

98LS1

Loss of backpressure can = loss of torque, but it's usually very minor and you still will pull harder throughout your rpm band.

SilverGTV8

I know that LT. But the fact of the matter is he said HP. But didn't state if it was dynoed or seat of the pants.

God I hope not seat of the pants. But, if he were to say it would stop an argument before it got crazy! LOL

jdaniel

Well after I got mine put on it felt like it was going to rip the engine out of the hood. Really did feel stronger. Did he do the fulll exhaust... I mean did he go with headers then to the Xpipe or is he running stock exhaust manifold?

Dan04COBRA

He didn't lose HP. His torque/hp just moved higher up in the RPM band.

jeep45238

Or he did loose it because he didn't torque the flanges down properly, and has an exhaust leak.

GSXRIntensity

Something to consider is that the flowmasters only give about two more horsepower over the stock cat-back, & the X-pipe does produce less ft/lbs as compared to an aftermarket h-pipe (not sure about the standard), & like Dan said the HP is made in the upper part of the rev range. He may have lost a little torque w/the x-pipe, & those Flowmasters are helping him gain anything either.

Dan04COBRA

Good points!

Certainly the Flowmasters aren't helping much, but the x-pipe alone will add torque and hp to his application. I'm more than willing to bet the addition of his x-pipe just moved his HP & TQ higher in his RPM band.