Hey guys, how much whp are we talking about when we compare a average set of test pipes vs a average set of high flow cats? How big of a difference is the noise?

 

If you get resonated tp's the noise is the same. NA its maybe 2-3whp peak and some midrange-tp's having the advantage, I dont know what other reason than for emissions (in this case learn to do the swap yourself) anybody would spend $400 on hf cats when you can buy tp's for 1/2 and gain more. And boosted tp's do 15+whp more than hf cats its been posted.

 

I with I had some objective numbers, but I know of none. Test pipes will get your a couple more horsepower than high-flow catalytic converters. For noise, test pipes are a couple of db louder.

 

Depending on the your modifications but usually its very minor for a NA car...maybe around 2-3 whp top from my experience.

Thanks,
Tom

 

So if you have full exhaust and stock cats, your telling me the difference between resonated test pipes and high flow cats isnt much?

 

Correct. High-flow catalytic converts are reasonably free flowing. Better than OEM catalytic converters, but not quite as good as test pipes.

 

as much a i want to get TPs i dont wanna deal with the smell.

 

What would have more gains? Test Pipes or HFC with Aftermarket exhaust and y pipe if your N/A? Because i heard aftermarket exhaust doesn't give that much gains either and i dont wanna get exhaust and test pipes cause that might be too loud for my taste. So what you guys think would give better gains? Test Pipes or HFC and Aftermarket exhaust and Ypipe for N/A??

 

how? you stick your nose at your muffler?

 

roll down both windows at the red line .......you don't need to stick your nose in there.....try it and tell us how you feel .....

 

If you don't want loud, bad fume or rasp.....just got with the HFC.........

 

Yea but if im going test pipes im probably going to go with resonated ones such as the labrees resonated test pipes. I dont mind the fumes much and i dont think the test pipes would be all that loud if i stick with a stock exhaust setup. I just want to kno which one would give better gains test pipes or aftermarket exhaust + HFC on a N/A setup? Im deciding to do one or the other, what do you guys suggest? Cost doesn't matter by the way, just tryin to get the most gains with basic bolt ons without setting off car alarms when i drive by.

 

Horsepower vs noise. Why not select one of several more quiet cat back exhausts. Many recommendations in this forum.

 

Even quiet exhaust will be loud if you have test pipes on. Especially when i have headers also. I dont think i ever heard anyone say they have headers, test pipe, and exhaust setup without the car being loud.

 

The HFC/y-pipe/exhaust will obviously have more gains because you're getting rid of a higher amount of restrictive piping. Unless you mean either test pipes or HFC's. Then the test pipe combo will yeild more.

 

just get the resonated test pipes (i would go with labrees)and a ypipe. that combo will get you the best gains for the money. changing the midpipe will make it louder and changing the muffler is primarily cosmetic. so if you are happy with what the oem exhaust looks and sounds like, you really only need res. test pipes and a ypipe.

 

I think HFC's are better suited for CA because our emissions laws are rediculous. Oh by the way I picked up a white 06 Enth. model yesterday from performance nissan. Thanks performance nissan!

 

congrats on your z!

hfc's are a good option but technically they are still illegal. you are not suppose to change your cats with anything other than an oem cat unless your car is past a certain age (which doesn't apply to us). but the chances of getting caught is probably very slim.

 

Damnit California, change these emissions laws!

 

i think arnold has bigger problems to worry about.