Best CatBack exhaust GSX99

[Chrisgys]

Hi everybody, I would like to buy a cat-back exhaust for my gsx 99 and I would like to now If the Apex world sport is a good one to gain some power or if I better chose an other one. I also would like to know if a cat-back exhaust is good or if I better but an complete exhaust on my GSX 99. Thanks

[kjewer1]

Dont bother with a catback that necks down to stock cat flange size. Do a turboback if you want to gain power.

[beatdown944]

fatfuck here says modern cats dont reduce power much and do a great job of cleaning up during 95% of drive time. I would opt for a high flow cat. another reason would be due to roadside inspections going on in many states. expect a $2500 fine for not having a functioning cat (cali) diameter wise a 3" or more is a must. I would also go with the Greddy.

[kjewer1]

Has fat fucker switched from a modern highflow cat to a test pipe and picked up a couple mph at the track, on a measly 14b? I doubt it. I also recomdned using a cat in states that have inspections, but I would never go so far as to say they dont reduce power much, even as vague as that statement is. It needs more qualififers. What is the effect of a cat on a 14b vs my T67? Could I flow 64 lbs/min through a high flow cat without losing "much" power? Would I ever try it? No, and no. Blanket statements like that make poeple look like assholes.

But cat or no cat, has nothing to do with the question. I still recomend a full turbo back over a catback. You can get them with highflow cats.

[beatdown944]

haha, no I have'nt. It all depends on what dude wants. I'm just throwing out my opinion. I dont think he is trying to run 12's or anything by bolting on a exhaust. I do not know where he lives either. Basically, I dont know, so dont take these comments too seriously.

[LandoAWD]

Originally Posted by beatdown944

Basically, I dont know, so dont take these comments too seriously.

If you don't know, don't post.

Simple.


Kevin is right, an exhaust system is only as good as the point of the MOST restriction, and both a stock DP and cat would choke the hell out of any gains to be had with exhaust. Full turboback, DP and catback with test pipe, or go home. If you live in Cali, you may consider that cat, though.

[KevinE326]

full turbo back apexi N1 exhaust.

[LandoAWD]

Why?

Don't come in here and spew mindless brand-loyal shit like that and not back it up.

[KevinE326]

Originally Posted by LandoAWD

Why?

Don't come in here and spew mindless brand-loyal shit like that and not back it up.

exhaust is full 3" exhaust; except for in the very front of the dp where it is aprox 2 1/2 for about 4 inches. after that it is a full 3" to the muffler. the apexi dp eliminates the cat.

The exhaust note is nice not ricer and you get very nice gains out of it. He originally mentioned the world sport which is pretty much a waste of money.

maybe if your state has harsh emissions laws and they have to inspect your car you would want to look at a hi flow cat. Im in florida so with no emissions laws im cat less.

[LandoAWD]

MUCH better.




Edit: Just know that 3in mandrel bent piping, homebrew to full titanium, is 3in piping. You are most often paying for a name.

[KevinE326]

at work so have to try and post fast so as not be obvious that im REALLY not working.

[beatdown944]

whats that now?

[TreeFrog]

Borla baby!!! wish they made one for the GST... so now i'm going with a Greddy EVO 2

[Chrisgys]

Ok seems as the turbo back exhaust is the best but another question, if I only remove the cat and keep my original exhaust is this a good idea. do I gain some power or not ? GSX 99

[JoeWagon]

If you have the equipment to make a test pipe, you can make yourself a full exhaust, or at least buy a downpipe and make the catback. You might get small gains, but I would recommend saving the money for the real thing.