Question.....I have a Ultimate racing downpipe, test pipe and just received my HKS from Gruppe-s. I need to know if anyone
is or has ran this set up and how loud is it going to be?

Rating the stock exhaust note at 0% will it be another 50% or more...or just unbearable , just want to hear the people in the back seat if they are trying to get my attention.....Thanks alot guys...Thinking of having a dynoflash, but don't know ECU will make it in time for the x-mas sale.

 

I have the HKS downpipe, stock cat, and Carbon-Ti on mine and don't have any complaints. I can hear people just fine in the back seat.

I rode in a Evo with my setup, but it had the Perrin cat delete and it didn't seem any louder.

Don't know if this helps.

 

I rode in an EVO with HKS 30th aniv catback and it wasn't loud at all. I would say the increase over stock is minimal. Using your example I would rate it at 10-15% above stock.

 

i just put the 30th on a couple weeks ago...still stock downpipe and cat, it doesnt really sound too much different than stock, except its alittle louder when you WOT but not much...I have the UR test pipe on the way to add with it.

 

its pretty quiet even with a test pipe..

 

Once i rode in an evo with AMS... cat-back itself i thought AMS was louder.. now looking forward to ride in an evo with ams cat-back as well as downpipe so i can compared it to HKS

I have the HKS 30th+Ultimate downpipe+ Ultimate 3inch HiFlow cat.. it is not that loud if u have the catback itself. Once you get the downpipe and the highflow cat, it becomes lot louder

personally, to me, it is loud ... especially when you go full throttle...

 

I plan on getting the 30th also, w/ hks downpipe. I just hope it is not as loud as my 99 si was w/ i/h/e.

 

Your Evo will never be as loud as your Si. I had a ITR with a AEM CAI and N-1 and my Evo doesn't compare with my setup on it now. If it is louder, it sure doesn't seem like it. Sounds alot cooler though.

 

Thanks Corey, I know your running the same setup I want to get
and I just could'nt take the si ting anymore.

 

i have the hi-power with a 3' custom exhaust with 3' highflow cat , and is just a bit more then stock . Its a great exhaust and not loud at all ...

 

That kinda sucks...i was so set on getting an HKS catback too. But how come they sound pretty loud in videos and sound clips?

 

I think that the hks cat back and downpipe sound perfect for the evo 8. Not that loud but a lot better than stock. That is the setup that i'm going for soon.

 

It is hard to explain really. It just has a nice, clean sound to it. It is louder than stock, but not raspy and nerve racking like it would be on a Honda.

 

But is it true like wojo said only 10-15% louder? That sucks. I thought they would sound awesome???

 

Just because it's not 100 times louder it doesn't mean it doesn't sound better than stock. It sounds alot better than stock.