GreenMachine Posted October 28, 2006 Report Share Posted October 28, 2006 Rather than hijacking all the Muffler threads I thought I should start my own. The FSM doesn't really give much in the way of specs for the system (still haven't figured out where these things list part numbers) but from what I gather it goes something like this: __________________________________________Muffler crossover--pipe--catalytic converter--pipe-----Y-Pipe= __________________________________________Muffler Out of those pieces it seems like the only pieces "muffling" the sound are Cat and Mufflers (my FSM makes no mention of a Resonator). My concern is that with my misfire problems I killed the Cat. Both mufflers when I have my ear near them are making the same sound, and I was thinking that both mufflers going at the same time is kinda rare. Could misfires damage the mufflers instead of the cat? Worst case is it killed cat and both mufflers, there were some pretty bad sounds when I was on the highway diagnosing the car. At one point climbing a hill it felt like a hammer was hitting the floor boards. Glad all that's fixed.....now the car is just getting louder and louder, but still smooth in operation. Slowly but surely its becoming a hot rod sound, then it will bleed me ear when what ever is dieing dies. So if it is the cat what do you recommend as replacement? If its the mufflers I'm pretty set on some of the Borlas, seem to be priced pretty good, people who have them like the sound and get good comments, what size would I need? I think I recall people saying the pipes were 2 inch so 2inch mufflers would be "bolt on" right, or do I need to go slightly bigger with 2.25 inch? The reason I'm considering aftermarket is the OEMs seem about the same price as the Borla options. The thing that concerns me is that most of the threads I've read have been post 2000 Devilles and post 98 Sevilles. I don't have the "quad" look to my pipes with the nice chrome tips, just some down tips that don't have anything fancy and are pretty hidden. The car will be going in for paint in the next couple weeks and I think I'll just have my long time trusted shop take a look at it, rotate the tires, lube it up, change the oil and such since its getting cold and the rain doesn't want to stop for long enough for me to do any work myself. http://www.borla.com/products/product_mult...|Turbo+Mufflers The Green's Machines 1998 Deville - high mileage, keeps on going, custom cat-back exhaust 2003 Seville - stock low mileage goodness! 2004 Grand Prix GTP CompG - Smaller supercharger pulley, Ported Exhaust Manifolds, Dyno tune, etc 1998 Firebird Formula - 408 LQ9 Stroker motor swap and all sorts of go fast stuff Link to comment Share on other sites More sharing options...
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