hades

I've got the full APS exhaust on my WRX, including the high flow turbo outlet. I know the outlet is optimised for the STi, as I had to grind (as per inclosed instructions) to suit the smaller turbo in the WRX. Noise wise? The full system on my car is slightly quieter than an STi with prodrive backbox and straight through centre, although noisier than the standard STi system. I think the noise, particularly with a few revs on, is fantastic, and a lot of people have commented "your exhaust sounds nice". suits me, anyway.

Power gain? On the WRX it was very significant feeling, earlier spool up, more torque everywhere, much freer at high revs, although I didn't get figures with just the exhaust. With that, plus scoobysport up-pipe, ported headers and a samco intercooler hose and an ECUTEK remap, I'm now running 284bhp & 272lbft, with a significantly better torque spread than most WRX's with up-pipe, exhaust and TEK.

Edit to add: Jamie Whitfield (JW Racing - they have a banner add and are in scoobyshop) sells these and has fitted one to his STi. He's a friendly and helpful chap, so speak to him!

[Edited by hades - 12/7/2002 11:58:33 PM]

hades

Boost spikes? Not that I noticed, but then again I don't believe the WRX is as prone to them as the STi.

CEL? That is by all accounts a bit of a lottery. Some people get them with a sports cat, yet I know of some who haven't with a full de-cat. I had one on the catalyst inefficiency code a few days after I decatted the up-pipe, although it was cleared when I got it remapped on Friday, and it hasn't come back yet in about 200 miles. With the STi you don't have an up-pipe cat to start with (and therefore the ECU isn't expecting to see the benefits of one), so you'd be less likely to have problems than me. Cobb tuning use the exhaust in the USA, and I believe they claim something like 80% of cars don't get a CEL. If it comes to it, there are ways round it anyway!

edited as it didn't make sense in the middle

[Edited by hades - 12/8/2002 3:08:47 PM]

Re-Volt

Dave and RT thank you for your help. i guess i will go for EBC. sounds more safe ..

thank you again ..

[Edited by Re-Volt - 11/10/2002 9:28:14 AM]

Re-Volt

hello all

i am thinking to change the sti7 exhaust i am thinking of HKS hi - power system. also thinking to change the uppipe and downpipe. would that be ok to the car ? should i expect boost spike?

in the future do you advice installing Apexi Super AVC Type R ?

thank you in advance.

Dave T-S

Without changing restrictors (which aren't guaranteed to correct it, perticularly with an up pipe added) or other means of control, you are guaranteed 1.5 bar spikes with a turbo back system and 1.7 bar if you add an up pipe.

Any reputable supplier should know this and advise you accordingly.

Re-Volt

Thank you Dave for your kind reply. what do you mean by other means of control ?

RT

One thing you can be sure of - if you decat a std STI7 without any other changes, you'll at least see a 1.5bar spike. I've heard other local JDM STI7s that have spiked to 1.7bar.

The cheapest way around this is to drill out the std turbo wastegate actuator restrictor, prob to 1.2-1.3mm. This should keep boost to below 1.3bar in the higher gears.

THe expensive way is to get an EBC.

Dave T-S

ReVolt
ECU work - Unichip, Motec, PPP, EcuTek etc

ScottishMenace

I got the results I was looking for with the Milltek system form Litchfields.
http://www.scoobynet.co.uk/bbs/thread.asp?threadid=148339

Dave Allan

Re-Volt

Dave Allan thank you for sharing the information ..

Re-Volt

hello again ...

do you advice to install APS full exhaust system + High Flow Turbo
Exhaust Discharge + High Volume Dual Vent Blow Off Valve ?

any one installed one of these ? or the full system ? can you please advice on power gain and noise ?

thank you in advance.

regards

Re-Volt

thank you hades ... i will contact jamie ...

did you have any problem with the CEL when installed ? boost spikes ?

Regards

swan

A local nutter did a full decat, EBC and NOS.

Re-Volt

thank you