The SP Engineering is the same as the Helix. I have installed one before. Very beautiful piece. Had no problems w/ the install. Cleared the lower tie bars (by MAYBE 1/4", but shows no signs of rubbing) and doesn't seem to have any problems being too close to the oil pan.

 

thanks for the information. I have heard that some people have had CEL come on after installing some downpipes. Is this true or does just depend on if a test pipe is added?

thanks

 

Z1 auto has the tanabe DP for cheaper. I have it and love it. It aint got much bling but it is one of the few 70mm DP on the market. I belive it is a bit larger then the HKS but not by much.

 

There is no way a downpipe can trigger a CEL. The cat is what will trigger it or the lack of a cat.

David Buschur
www.buschurracing.com

 

Does a downpipe decrease the amount of boost?

 

How much power increase will the Helix DP add. I am getting mine today along with a HKS Carbon TI full cat back. I havent seen any numbers yet.

 

Decreasing backpressure in the exhaust will increase top-end RPM pull and usually give 1-2psi of boost over stock. Any full 3" turbo-back system is usually good for up to 20whp.

 

I got the Invidia DP 3" SUS stainless steel....Does not clear tie bars even though I was told by seller that it would....and does bolt up to stock cat

 

There is a possibility on a car with a good enough wastegate that the boost could drop. It normally doesn't.

David Buschur
www.buschurracing.com

 

Got AMS to install my hks 2.5" dp, and ur 2.5" hfc bolted to my existing hks hi-power catback. Wow what a difference. No increase in sound levels, turbo seems to spin up faster, and there is a definite gain in hp and torque. I just cant wait to get my xede and then reflash the ecu so I can make more use of my mods. I might try a 2.5" test pipe for more power but if its going to make my car louder, Im going to stick with the 2.5" hfc for daily use.

Sorry didnt dyno before and after the mods. Trying to save the money for the xede and some other stuff.

 

Just FYI for all you considering DPs and exhaust systems -

Stock, my car hit max boost of 19 psi at 3500 RPMs, tapering to about 16 psi at higher RPMs.

After I added my Buschur 3" downpipe, high flow cat, and 3" cat-back I hit max boost of 20-21 psi at 3000 rpms, tapering to about 16 psi at higher rpms.

After adding an RMR intercooler pipe, Hallman MBC, and Dynoflash I hit max boost of 21 psi at 2600 rpms and hold 20-21 psi until redline. Of course I can vary the boost from 12 to 30 psi with the boost controller and it holds steady. It only drops about 1 psi near redline.

As you can see, any time you can reduce the back pressure after the turbo and/or increase the efficiency of the turbo system, the turbo spools quicker. This leads to increase power at the low-mid rpm range (3000-4000) as well as increased flow and power in the high rpm range.

Hope this review of my experiences helps.

EVOlutionary

 

Very nice, typical results and you car should fly. At the boost levels you are running and the parts you have on 94 octane that car should put over 300 horsepower to the wheels.

Thanks for buying from us.

David Buschur
www.buschurracing.com

 

I have the Greddy Ti is it a 80 mm all the way? or does it get smaller never got to measure it so im not sure...

secondly does anyone have the vishnu downpipe installed? Hows the fitment?

lastly does anyone have the apex gt 3" downpipe installed?

Cus im looking for a perfect fit downpipe for the evo... 3 inches

 

the greddy ti is full 80mm no taper. that says nothing about your cat however.

chances are the apexi unit will fit. but just in case rmr makes a tie bar with a groove in it for fat down pipes to fit through, this is the only surefire way to get your dp, custom or otherwise, to fit with no rubbing and vibration. the stock tie bars just aren't made to clear anything but stock... in fact... the stock dp is flattened there. replace the problem, don't retrofit a dp that is gonna snag you less horses than your car desrves.

 

Really? I remember calling Greddy, RSR, JIC and HKS... they all told me that ALL of
their US spec catbacks will taper to 2.5" to fit the OEM cat.