Exhaust Question??

I was thinking about unhooking the muffler on my car. I was wondering if this could have any mechanical side affects besides being loud? Also will removing the muffler completely increase or decrease horsepower?

No it won't have any negative side effects besides the sound. You might be able to feel a slight pick up at higher rpms.But either way the loudness will be the only real difference..

Ok I unhooked the exhaust at the muffler. It sounds loud, but not bad. I noticed that the rear of my car, mostly by the gas tank and underside of the rear of the car is getting really hot. I was wondering if this could cause any problems. You know like melting hoses, or even cause the gas tank to explode. I didn't remove the muffler because i want the car to appear stock, I just unbolted where the muffler connects to the main pipe. Then I put the main pipe on top of the pipe coming from the muffler, so it is pointing slightly upwards.

Yes, you could melt things back there, you could also gas out your back seat passengers if you're not careful

If any thing point that thing down not up to your car lol

Carbon monoxide will seep into your car when you are stopped anywhere with your car running, and that is not a good thing.

yeah put it back on dude. you can't smell co2, and you will be dead before you no anythings wrong. just not worth it. risking your life or the lives of others on a muffler....

If you want your car to have a loud exhaust just buy a glass pack or something cheap.

If you want to have a louder exhaust but still the "stock" appearence just have a shop make you some 2.5" pipes and hollow out your regular muffler and maybe take off that cat too :icon16:

OK Thanks. I hooked back up my exhaust. I really don't care about the exhaust appearing stock, but i just don't want to buy a new muffler right now. Also how would I hollow out my muffler?

1. Cut it open rip every thing out (RIGHT WAY)
2. Take off beat the shit out of it with smaller pipes shuv shit in side till you get threw lol

will a catback really give 25 hp on this car?? i didnt think that catbacks made that much of an increas

will a catback really give 25 hp on this car?? i didnt think that catbacks made that much of an increase and also if i bore out the cat will the 02 sensors fuck up ?? because i was debating goin with headers and a downpipe but its gonna be a lot for a highflow cat and headers and downpipe thanks for the input

2. Take off beat the shit out of it with smaller pipes shuv shit in side till you get threw lol

Lmao that's one way to do it.

no, an exhaust will not give you 25 hp

yes, gutting the cat will foul the downstream O2 sensor and not improve performance a whole lot even if it didn't mess with the sensors.

lol

Gutting the cat or removing it will certainly not foul the rear O2 sensor. The only reason it gives a DTC is because the rear sensor sees an O2 voltage trace that cycles like the front sensors output rather that more of a flatline. This is why removing the rear sensor from the exhaust stream but leaving it hooked up will often eliminate the DTC/CEL.

Its possible to gain 25 hp on a turbo car for sure from opening up the exhaust, but not on an NT unfortunately. For the record, I've seen 10 second turbo DSMs pick up ~40 whp from dropping the 3" catback and running an open downpipe. Thats a shitload of power at that level. But off topic...

hey i have a 99 eclipse gs does any one have the apexi n1 catback on thier dsm if so what does it sound like and does any one know where i can hear a sound clip of what it sounds like on a dsm non turbo?
thanks

DSMtuners has an Exhaust Clip thread. Alot of them are old broken posts. Best i can do for ya.