Headers Question

[pobiom]

I have been offered Equal Length headers (H&S) for my impreza. But before i go ahead i have a few questions which i was hoping maybe you guys could answer.

1. With them being equal length, i know you loose the impreza burble, but does this also mean you loose the loudness of the exhaust too or is it just a different sound ?

2. What gains can i expect over the standard headers ?

3. After this is fitted will my car be ok with not having the ECU remapped ? (99 STI Type R)

All advice welcome ! good or bad.

[Dave K]

1. Yes it will be a little more quite, mine did when I put my un-equal headers on (off the car at mo but going back on), but with the blitz I don?t think you will notice.

2. You get around 30bhp/30lbft, but you also push the turbo spool point up the rev range by about 300rpm.

Feels a little bit more laggy but when it comes in it will hit harder.

Also to take full advantage of them you are best to go full de-cat, this will also bring the noise back up, so you should end up as you are at the mo.

This is also why I sold my Blitz, it was fine until I de-catted the downpipe then all hell broke loose, 5mins driving and you had a headache!

3. No, I wouldn't recommend it, the more you free up the flow the more risk of detonation etc.

But it's the old situation, you could and have no problems but on the other hand, it's all a gamble.

Take it your not selling now then?

[pobiom]

Was thinking about returning to the land of skyline, but sensibility has the better of me ! end of the day the impreza is 100 times cheaper to keep and run, so let the modding begin

Cheers for the info dave ! So once again looks like i'm kind of stuck with the bloody ecu ! I totalled up a trip to the uk and getting the ECUtek remapped and i reocn we are looking at £1K. For that i could out right buy an Apexi Power FC and Commander and fit it in. But the problem again would be mapping. Dave have you got the knowledge or a basic map i could use to map my own Apexi ?

[Dave K]

The Apexi will come with a base map, admittedly it's a JDM map but you just alter it to UK fuel and start from there.

Jim (Cret) is the man for Apexi, he fitted his a few month ago and is driving round on a tweaked base map with no probs, full decat to.

Jim & myself are just getting into mapping so couldn't fully map it, however I think Jim is looking to get Andy F to map his some time in the future so you could split the cost then and get him over.

I'm sure Jim will post on here with plenty of info for you; he has also got the datalogit software so you can plug the laptop in instead of using the commander.

I would say fit the Apexi on the base map, with a few tweaks from Jim, and then make sure you get a knocklink as a minimum and see how it goes.

This is Jim's website UK Legacy look under ECUs & Mapping.