I removed my after-cat and felt an improvement.Has been 2 days and have NO "check-engine"light problems.I ran a straight pipe in its place. Im going to bring it to a dyno asap.I will post hp gains asap too!

 

have u noticed a noise increase??

 

ya its raspy, sounds good though "deeper"

 

thats the way it sounds on my car with the HKS and custom b-pipe i might have to look into if the power gains are good!!! let me know when u dyno

 

test pipes on a maxima, eh? hmmmm...i wondered what would happen if i straight-piped my car..how's ur low end?

 

Believe it or not I noticed a differance quick.I dont know if your cars do it,but,when I used to shift my car to early and it was at like 1 1/2 grand I had serious LAG, than a 2 grand it would kick into a power band #1, now that improved the LAG dramatically.

 

Hey i went to the dealer and asked if i can make the 2000 max a duel exhaust car and they said i can't. They said somethind with an engine box at the back of the driver side under the car. Can you advise.

 

well they're correct about the "box". i believe its for the fuel vapor recovery system (dont quote me though,ill find out for you if you want) but you can run dual exhaust.what you'll have to do is get a hook-up at a muffler store or somebody that can weld good, Buy the apexi N-1 exhaust (it has two mufflers welded together and run a straight pipe or what the call "b" pipe all the way to the downpipe, Just dont take off the main cat because it has o-2 sensors that run to it. the apexi n-1 is kinda expensive but i have it on my car and i love it.The opening at the end of the muffler(where the tip is) is a tight fit but it works and looks good too.
OR you can get down right crazy and have the muffler come out of the center of the bumper like the way corvettes have them, if you do that you can get the 20th ae edition ground effects and take out the center section (yes the back peace is made up of three differant pieces) so it will be easy top do this mod.
dont mind the spelling, failed english, lol
If i can help you in any other way w/b

 

Just have a muffler welded where the resonator is, have the two pipes follow along, until where the normal bend is, and have the pipes exit on each side of the spare tire well. It wouldn't be a true dual exhaust, but, the look is similar

 

I got 7.5hpto the wheels just by removing the after cat.It didnt cost me a thing so im happy i would recommend this mod to everyone.Im pleased,and think its worth it.

 

7.5 hp at the wheels, not bad for a simple mod! Is the only modification to the car the removal of the main cat or do you have a y-pipe, intake, etc?

 

I have my transmission done( differential,clutch,flywheel)i have 19x8" wheels with 265-30-19's and i have my full suspention(front and rear STB'S, rear sway bar,and cattman coilovers). for cosmetics i have The real HID conversion kit for my headlights. NOw im working on my full exhaust headers all the way back.(give me a week )what do you recomend for a Y-Pipe? i need help i want a cattman i think but stillen equal lengh y-pipe looks pretty good

 

I bought the Cattman Y-pipe (as good/better than the Stillen and cheaper). They are running a special on the federal emission version for $399 (be warned that they are on back order). But I got the supercharged version (3" compared to 2.5" for the standard y-pipe). Since you a doing a custom exhaust, I would recommend the 3".

 

Hey, is the after-cat the one in the middle.. right before the resonator??

 

Yep, the main cat is between the y-pipe and muffler. The pre-cats are located in the y-pipe.