the HKS Hi-Power sucks?

alex_alex · Oct 29, 2003, 01:25 PM

I recently purchased one of these, and have yet to put it on my car. However, in speaking with David Buschur recently, a point was brought to my attention, that the HKS Hi-Power, although being a 3" system , has a reducer toward the front of the exhaust, so it can connect to the factory 2.5" cat.

Mr. Buschur mentioned that this effectively reduces flow such that a 3" is not too much better than if you had a 2.5" to begin with.

Does anyone have any thoughts on how this can be remedied?

93civEJ1 · Oct 29, 2003, 01:31 PM

i think he is trying to sell you a his brand

alex_alex · Oct 29, 2003, 01:45 PM

well, that may be true, and the Buschur exhaust is definately a good piece, but nonetheless, i believe Mr. Buschur has a point and i think it should be addressed by something other than an accusatory statement based on his motives.

Ultor · Oct 29, 2003, 01:47 PM

I think he makes sense....

For example:
Think of an hourglass. Eventhough the bottom is very large, that does not mean it has better flow, the sand will only flow as much as it's tightest restriction.

If you run air through a 2.5inch pipe into a 3inch pipe you won't get much more air flow than a 2.5inch pipe throughout.

The Emperor · Oct 29, 2003, 01:50 PM

i thought the hi-power exhausts were 2.6-2.7inches?

93civEJ1 · Oct 29, 2003, 01:54 PM

dont know...ive got my heart set on the HKS I am pretty sure....recently I have been glancing at the AMS........i like the angle output design.

93civEJ1 · Oct 29, 2003, 01:59 PM

last time i checked too 75mm converts to 3" right??? and their website says the piping is 75mm.

The Emperor · Oct 29, 2003, 02:07 PM

yea i checked their website too. says 75 mm(2.9 inches). iono i'm still looking forward to hks. if they don't have good airflow then why do they have good power gains?

blonde · Oct 29, 2003, 02:14 PM

the HKS exhaust is 75m= 3". however it does have a restriction of 2.6" which means that it will probably flow a little less than a true 3" exhaust. however, the flow difference is minimal and you will probably won't feel a lot of differnece. a lot of high hp cars use this exahust with no problem.

93civEJ1- let me know when you want to buy the exahust. i have a good suprize for you...

MrBubbler · Oct 29, 2003, 02:17 PM

why hks is the question, so many other exhaust systems so many! JIC is one too look at also i have nothing but good things to say about JIC! the exhaust is amazing!

leaveit2bevo1 · Oct 29, 2003, 02:20 PM

I have the hks dp and carbon ti, and that **** pulls hard but its prob more becuase of the dp than the cat back. When eigen engineering (Billy is a master mitsu mechanic I recommend them if your in socal) put the exhaust on it didnt look like it was that small, the piping looked all the same size.

EV0lut10n_8 · Oct 29, 2003, 02:30 PM

if the whole "hourglass" scenario is true...then why would anyone get a catback exhaust...you are still going from a restrictive 2.5 to a less restrictive 3" exhaust....the only concern is if you are eventually going to finish the whole exhaust and get a cat delete or a high flow 3" cat

93civEJ1 · Oct 29, 2003, 02:33 PM

i want to mate whatever i get to the UR test pipe, anyone mated a whole HKS setup, DP , and catback to one??? what were the outcomes??

The Emperor · Oct 29, 2003, 02:38 PM

going 3 to 2.5 to 3 again is less restrictive than going 2.5 all the way

MrBonus · Oct 29, 2003, 02:45 PM

If this is the case, wouldn't all cat-backs that will bolt up to the stock cat have to be 2.5" at one end?