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I have a 02 Civic LX Coupe. I recently installed an Apexi N1 Universal muffler with 2 inch piping on it. The shop did not put a resonator on the exhaust system. I was wondering if I am loosing backpressure resulting in HP loss. I raced a 02 LX yesterday with an intake, rims and a system. He beat me. Can someone tell me if I am loosing power without the resonator?

 
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There are alot of factors when you race and so I wouldnt put too much stock into the fact you lost to this other guy. They could be a better driver, have an enginer with tighter tolerances, etc.

As for you comment about the exhaust when you free flow the exhaust you end up getting a HP gain. You can lose some torque with less backpressue but usually its not noticable when racing cause you are using the HP band, not the torque. When you have a loss of torque you will feel it more from a dead start or when you are short shifting

 
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this race was off a red signal and we both had a dead even start....i am not sure if his was a stick or not....I am sure that i have lost torque because his takeoff was much faster then mine...i really dont know if I should get a resonator put on or not....I would like my torque back but at the same time I would like to keep the same amount of HP.

 
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oh yeah by the way his rims should have aftermarket tires....that could help him launch better since he would have more traction...i am still wondering about the weight issue though