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quote:Originally posted by COP TZER
IMHO, you won't gain anything other than sound by changing the muffler, the stock one is good, ie. not very restrictive. The big issue is disrupting the flow of the exhaust fumes. The stock piping running over the rear axle looks like a damn pretzle!! Up-sizing the piping is very beneficial especially if you plan on running a boost controller or a turbine upgrade. All i have left to find now is a Down-pipe from the turbine to the cat and i'll have a straight 3" setup out the sides. Running out the sides by passes that whole rear axle problem, but it's very pricey[^]
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No doubt the straight side pipes are going to make a difference but you can't tell me that the stock muffler is not restrictive. Look at what DC did to the air box. Flowmaster claims a 20 hp increase with the 40 series muffler and stated to me to subtract 2 hp for my stock exhaust pipes. They would have loved to sell me a total CAT BACK but claimed the difference in performance was minimal. Now, I don't believe the claim of 20 hp but I have to believe these guys know what they are talking about regarding restriction of stock mufflers vs. after market mufflers. There has to be some gain in hp with just a muffler replacement. But, you know - I really don't care - the sound is worth the cost!
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\'03 GT Inferno Red AutoStick - Stage 1 - Air Box Mods & K&N Filter - AMX Intake Down Pipe - Flowmaster 40 Series Exhaust - Magnacor 8.5mm Ignition Wires - Pin Stripping - Chrome Side Spears - Chrome Tail Light Covers - Chrome Fuel Door - E&G Custom Grill - Painted Rear Mud Guards - 3-D Liquid Flames - Chrome/Red Neon Washer Nozzles - Interior Neon