This is a dumb question but can anyone guess about how much horsepower i would get on an 02 six speed with the berk intake and a custom rear section if i added a high flow cat, y pipe and b pipe from cattman?
Thanks

 

10-15.....

 

thats sound right give or take 10 - 15whp

 

is this crap.. Dyno and then find out ...

 

i was trying to be nice

btw...once the extra power gets to the wheels, you will hardly tell a diffirence. throttle response will be a little quicker but power diffirence will be impossible to notice. its there...but you wont really notice (butt dyno doesnt count)

 

I made 230+ with only headers + intake (stock cat back/cat.)

 

well we all know that catbacks dont really give us big gains.
largest gains are
3.0 - intake + y-pipe
3.5 - intake + headers

 

I honestly didn't know that

 

I thought 3.0's got big gains from timing advance?


when i say big i mean like 10+whp

 

no one has ever dyno'd to prove anything.

 

wouldn't matter anyway as it's just advancing base timing. You might have a little bit of low end gains but it mostly contributes to quicker throttle response...

 

I got a little more low end on the butt dyno after the timing adv. However it is nice to go with the high end gains of an intake and the headers.

 

a few notes:

1. timing advance probably won't show gains on a dyno. The timing advance has two main plusses: First, better throttle response at the low end. Second, smoother idle. If there are actual WHP gains, they are minimal (btw, I have timing advanced)

2. On a 3.5, the ypipe gives pretty minor gains. Ypipes are effective on the 3.0 because they eliminate the precats, so we gain alot of power from them. On the 3.5 with a ypipe your precats are still there, so not much gain. For 3.5 you need to go with headers for any significant gains.

3. Intakes alone are good for a couple WHP. Some more than others, and at different places in the curve (PR intakes have better low end power, berks tend to have better high end). The more "breathing/exhaust" mods you put together, the more the effects of each are amplified, generally.

4. bpipe is usually good for a couple WHP as it eliminates the crimp/restriction inthe stock bpipe. Mufflers really give no gains unless you are running pretty high power/FI/Spraying.

5. High-flow cat is worthless unless you're FI and need the extra flow, in my opinion.

 

Ahh biggest gains on a 3.0 are headers the timeing advance is like 5-8 whp. Headers are probably around 20-25 whp do to removal of the precats. Also those so called " RACE CATS " are a bunch of crap and huge waste of money. Just get a strait pipe off ebay to replace the cat.

 

OK. so after these inputs, i would like to know how much louder headers will make the exhaust tone? I have a custom axel back section with a borla muffler and im afraid it would be really loud. anyone have sound clips or suggestions, cause i dont want a super loud car. Also, the clips i have heard make the tone sound really high with the stock cat back and i dont like it much. i really like the sound it has now and im afraid ill lose it.
Thanks

 

One thing to consider is after headers, you might be able to pull 20whp but only after tuning. Headers typically make it run pig rich and you could even be worse off than before. To make the biggest difference you would need an afc or some fuel tuning program to take fuel back out. My AE went from a perfect 13.0:1 almost across the board to a 11.5:1 almost across the board after headers. Headers with a b pipe and any kind of straight through muffler will be loud, at least IMO. I went with hotshot headers, stock cat, cattman b pipe and stock axel back. Best blend of performance, money spent and sound IMO.

 

I have a 3.0 5-speed.

I have all the bolt ons

I have to say honestly the VIAS removal and "3.0 SSIM" mod gave me the most ooomph. Even more than y-pipe and full exhast. 17 degree advance give *a bit*

...I have yet to dyno my car.

Currently I'm undergoing some maxipad rennovating.

Starting with some Cattman Gen1 headers with JWT popcharger to replace my 3" filter. EGR removal, yada yada yada.

We'll see how that turns out.

I'm going all out top-end power to trade for my low-end torque.

 

Exactly right. I'm running a very similar setup and with a stock muffler the sound is fine. You hear it under acceleration but at cruise it's quiet with no drone at all. Even at full throttle it's not that loud.

The performance gain after the headers was very good too. I had a Y-pipe for a while then went with headers. I should have just done the headers and not waisted my money with the Y-pipe. I dynoed with the Y-pipe then with the headers. The headers gave me a lot of torque in the higher RPM range which, of course, calculates into higher HP.

 

Look around here a bit:

http://forums.maxima.org/forumdisplay.php?f=48

 

So, what you've said is essentially what your av is....on the way out.

Get cams.


There's an eshaust compilation (sound) thread on the top of the 5g forums, use it.