4inch exhaust?
 

im looking foward to upgrade my exhaust setup to an 4inch all the way .... right now i have 3inch DP,MP,Exhaust . my question is from my hotside of the turbo where the DP attached to is V-band clip, in order to change it out to 4in dp and ect, is there a 4 inch dp vband ? or it goes from 3inch out to 4inch ?

Not sure but check out the HKS 4" titanium exhaust, I think you'll find the information on the HKS site.

Yes there is. There are different styles of flanges though, so it might be a good idea to take some measurements before ordering. How much power is your car currently making? Why do you think you need a 4" setup?

The HK$ 4 inch is INSANELY loud. I had the opportunity to hear it at rotorfest recently, and it's not suitable for a street car, period.

A-spec fabbed me up a trick custom 4 inch turboback exhaust with a pair of magnaflow mufflers, one middle and one rear. There are flex sleeves that slide in between the exhaust pipes, and they're held in place by beefy clamps, so flanges needed. It's a nice lightweight setup, and sounds amazing at WOT. The best part is that the noise levels are liveable on the street.

PM Zero R for more details :)

Yep. That was my exhaust Rich heard. Loud is a matter of opinion ;-)

They have a siliencer that you can put in the tailpipe to reduce the noise if you are so inclined. I'm not so inclined :)

But Rich is right. It is freaking LOUD. I have a 3" downpipe connecting to the 4" HKS exhaust. When I was getting my car dynoed, I stood behind the car. At 15psi of boost the exhaust was painful to the ears. No joke.

But a little pain never hurt anyone. lol.

Sean from ASPEC also custom made me a 4" exhaust and as rich stated above, its really nice.

Mine only has one magnaflow muffler, and although i havnt heard rich's exhaust in person, i would say mine is slightly louder at idle/wot. I did save a couple more pounds though.

Quality really is top notch, i would fully recomend them!

hey rich any pics of the exhaust

Damn

Ari @ Rotary Performance (www.rx7.com) makes a custom Greddy 4" turbo back exhaust. I have it and its bad ass!

Pics and pricing, please..

I have this exhaust on my FD and I honestly LOVE it. I don't think it's too loud at all. It has a nice deep rumble to it at idle and gets decently loud at WOT, which I don't even mind. Just turn the stereo up :).

the HKS 4 inch will rattle your brain, it is raspy and it will make you def in a month

Scroll down to post #3:

https://www.rx7club.com/single-turbo-rx-7s-23/some-uninstalled-pics-my-500r-other-mods-being-bolted-596301/

It probably will. It is loud (without the silencer) at just about anything off idle. As boost builds about 4000 rpm (single turbo), it goes from loud to crazy,insane, go-to-jail LOUD :D

I wouldn't change it for anything. Plus its a 4" straight from the downpipe back. Nice thing is that there is a small sections (about 4 inches) at the front that attaches to the main 4" pipe and necks it down to a 3 inch with a flange so it can be bolted up to a standard 3" downpipe. You can remove this section (attached to the main 4" pipe by a V band clamp) and have a custom 4" dp that would attach right up to the 4" exhaust and and thereby have a complete 4" all the way from the turbo back.

Also note that this is a complete 4" system. The main pipe is one piece from the dp to the muffler so if you need to smog and add a cat, you have to swap the whole exhaust for a cat and a cat-back to smog. You can't just unbolt a "midpipe" and reinstall.

Sorry. No pics. Its installed and the car is only about 1.5 - 2 inches high so its not like I can get under to take any ;)

BTW, nice exhaust Rich. The HKS exhaust does NOT have silencer in the main pipe (unlike Rich's exhaust) so its a 4" straight pipe from the dp to the muffler.

Terry