How is the stock exhaust set up. Are there any pics from under the car??

 

no

 

1. Go to your garage.
2. On your back.
3. Peek under your car.
4. GENIUS

 

Catalytic converters and the stock Y are pretty restrictive...

Otherwise, not bad...

I always argued that a stock exhaust setup with cat pipes and aftermarket Y (fujitsubo, AAM, etc.) would be *almost* as good as aftermarket... considering aftermarket exhausts usually only offer 6-10hp gain anyway (Y included)

 

Pic from down under.....

 

I put my OEM exhaust in the trash, and didn't take any photos. I agree with Silkk: if I had enough money to replace only two items, it would be the catalytic converters and Y pipe.

 

Is that the optional rear diffuser under the rear muffler? I have not seen one before.

 

How loud is it without the cats and an aftermarket y pipe? On my 02 Altima I had hotshot headers with no cat/straight through to the Stillen exhaust, and I swore I would never do anything that loud again.

 

really loud and raspy, i know this first hand, test pipes, jic y pipe and stock muffler, only had the car two weeks, ordering my jic single 3inch, just havent had time, been working too much..

 

here are my pics from switching from stock to nismo w/cat delete's...notice the bends...

 

I've just put on my new nismo catback and it sounds great but it's about as loud [under acceleration] as I'd like and I really want highflow cat's but am wondering how much louder it will be after that?

 

I don't have NISMO, but still give it a thumps up. Beautiful workmanship.

 

High flow catalytic converters will increase exhaust gas flow. The exhaust will be more noisy. How much more noisy is impossible to say. If you look at mods such as headers and high flow cats, its next to impossible to keep the exhaust system quite.

 

Davidf-if yuo want the power of test-pipes without the raspiness do resonated test-pipes....

 

I had the resignated test pirpes with the nismo and it did make it louder. It was raspy for a few weeks, then settled down. If you don't want more noise, I wouldn't swap your cats, although the power increase is nice.

 

Nice setup I like your high flow cats!

 

Here are pics of the oem Y-pipe with it's protective heat sheilding removed.









Also the oem cat inlets and outlets dial caliper out to about 1 7/8" diameter.

 

I think the best exhaust setup would be, headers, high-flow cats, and an aftermarket Y-pipe. Keep the midpipe and your muffler, and your stock exhaust will sound meaner, deeper, and louder, but still retain the stock exhaust sound.

 

Itll sound exactly like ur altima..same engine afterall. Maybe a little more raspy since there is no B-pipe. The more free the exhaust, the louder and the raspy ness is caused by the fact that the exhaust is dumped into a pipe.

 

Yeah I acually considered highflow cats. and putting my stock muffler back on but am concerned about the power trade off if any.