Iight fellaz check it out.. i want to delete my 3rd cat in my car and replace it with a race one....

which one out there is good? i need help on this dont kno any brands.

plus would it make my stock exhaust louder? keep in mind i have a stage 3 exhaust (dynomax)

 

Why not just install the ATLP test pipe?

 

there are 6 optios for you

1. megan test pipe - $90...2.25" in/out
2. gut current cat - free... no measurable in/out
3. richie v6 test pipe - (not sure on price)... 2.5" in/out
4. atlp test pipe - $125 I believe - 2.5" in/out
5. atlp hi-flow 3rd cat - I think mike posted $325 not out yet - 2.5" in/out
6. richie v6 hi-flow 3rd cat - no price yet - 2.5" in/out

 

ive been thinkin abt doing the same thing but i talked with a guy here and he was like there was no point in replacin the third cat since there would be no performance gains...is there any truth in that and outta those 6 which would be the best choice for max performance gains/sound gains?

 

performance
here is the thing, if you are running one of the 2 jpipes available for our cars... and you are running the stock cat... you will gain from removing it

if you are running the stock jpipe, stock exhaust... removing the stock cat, not even worth it honestly, you'll get something top end possibly 2 maybe 3 hp which could be chalked up as dyno operator error or what not...

sound
when I installed the procats I didn't get any louder... maybe lil more droany... after jpipe = raspy up top... gurgle when you let off...

 

i will def get a atlp j-pipe or the other brand

 

is it true there is a significant decrease in gas mileage after jpipes are installed?

 

I think it is tied with the fact that gas quality has decreased... or you can chalk it up to the slight loss in low end which means on your daily drive you require slightly more throttle down low... I for one have been stuck at 14mpg city for a year...

 

waitasec... I thought going no cats & J pipe would help it breathe easier and increase MPG? Why the loss?

Also would no cats & J pipe be much louder with stock exhaust? I hate rasp...

 

I dunno man, when I first installed the atlp jpipe I got a 3mpg boost... it went back down cuz I started driving heavy with teh foot rofl cuz it sounds soooo damn good rofl...

no cats and jpipe would def increase mpg... most of us go by the mid, which is an estimate of course

 

k. scared me!

I keep being told semi-contradictory things as far as the exhaust sound is concerned, I was going to keep stock exhaust after the test pipe, is it going to get all raspy? deeper and more g35ier is cool, raspier =

does a resonator or muffler get rid of rasp? I still can't figure that out.

Muffler gets rid of rice and resonator gets rid of rasp?

 

I agree, I noticed a decrease cuz with ATLP exhaust and Jpipe it sounds SOO nice!!!

 

if you do not touch your stock exhaust you will keep relatively the same tone, slightly louder doubt it will get raspy...

stock exhaust has 3 mufflers and 1 resonator, all work in conjunction to make the cabin exhaust noise free....

 

sweet. but still leaves the question, muffler for rice, resonator for rasp?

 

I dunno, I mean the tl will never sound rice even with straight pipe, it will just sound deep and raspy... I've done a few exhaust setups, and the loudest one, was straight pipe with skunk2 mufflers, and it didn't fart like a riceracer... so i don't think it will be possible at all to get that rice sound... rasp yes, my car is raspy top end... but a good rasp

 

Ok, let me help clear this up.

With the J-pipe, you help clear up resistance in the stock exhaust and help the motor breathe out easier. BUT there needs to be a bit of back-pressure with the exhaust to have low end torque, hence two stage systems like in the RL and MDX. If you get rid of the cats, add the j-pipe, add an ATLP exhaust, you will loose most of the back-pressure, but that's if your NA. If you have a supercharger, it will be more beneficial as more gases are produced that need to escape.

Due to the loss of the low end torque, you must rev higher (wasting more gas) to get the same rate of acceleration. Just as for everything, everything in moderation.

 

Well all on the same day I plan on adding:

K&N CAI (thermally wrapped), P2R TB Spacer, IM thermal gasket, UR pulley, Precat deletes, J pipe, and Test pipe.

if I drive gently would I get better mileage?

 

damn ur car is going to be heavily modded wow dude... which im thermal gasket... outlaw engineering?

 

Actually Excelerate's. I'm waiting on it and the test pipe, they should be here next week. the precat deletes should be here in 2 weeks, I'll probably chuck all this on at the end of June. I want to do it all in the same day, so it's a huge difference it's hard sitting on all these mods though! I forgot to mention the ground kit, but it won't make a heckuva big diff.

 

How much is the IM gasket? Is it really worth the time/money?

 

30 bucks, and worth the money, worth the time if you have the time. should only take a couple hours, but keeps the manifold much cooler, and reduces IAT's

 

The CAI will reduce a little bit of low end torque, but increase high end torque. The P2R spacer and gaskets will keep the car cooler and keep the motor from heatsoaking, not a really big difference unless you drive like 50 miles in the city everyday. The UR pulley will help the motor revv easily, meaning more power quicker, you will notice a .2 gain from this. the J pipe should help keep the low end torque, but the test pipe may reduce the torque.

 

im leavin my stock exhaust on screw it.... later on just get my S/C and ill b good

 

you will not want to drive gentley....crap the day i got my jpipe done i was goin up and down the highway at pretty silly speeds just cuz i wanted to see just how load i could roar lol.....

 

well here's a pertinant question, I have a deposit on the precat deletes, I could probably still get that back. for the amount of PITA it will take to install those, if I'm potentially going to lose low end power and lose gas mileage from it (I have no plans to go FI) should I just leave that mod out? I'm looking for mods that make the car peppier and get better mileage. I don't race at all and I do drive "spiritedly" on semi frequent occasions, but I don't want to have to be at 5500 rpm all the time to make use of these mods...

 

from the test pipe delete dyno sheets I saw gains all the way around... so it is really up to you... I mean I am going to dyno before after also just to see

 

sure but I meant precat deletes... or is that what you meant too?

 

yea I ment precat deltes too dude...