Clarkie172

Basically I want my sti to get around 320bhp. To do this I have read it will be panel filter,exhaust,fuel pump and re-map. My question is....can I do it all seperately? Ie panel filter first then possibly the exhaust etc etc finishing off with a re-map. Or do they run like a bag of poo with mods and no re-map?

can I achieve 320 with centre section&backbox,panel filter and re-map or is it cats taken out/sports cats and fuel pump jobbie?

JimmyBFC

id have thought you'd need it entirely de-catted save a sports cat for it to reach that mate, you can fit the panel filter 1st, then exhaust but many recommned exhaust and re-map together, and personally thats what Id do, get it all done together and straight upto power like you want

sounds about right tbh, it might be nearer 330BHP aswell

Clarkie172

Id like to get it all done together but cant afford it for a while. maybe ill have to save and wait and get it all done at the same time then.

oh but I want a nice angled afterburner vortex!;-)

swifty.....!

iTrader: (4)

you'l need a sports cat or decat then rest you've listed and needs all doing at once but you'l see 330bhp minimum you could buy the cat back exhaust and fit that so you get the noise til you can afford to do rest of exhaust and bits etc

Clarkie172

with the decat is it both needed doing? up/down whatever the exhaust is like on them

swifty.....!

iTrader: (4)

the up pipe hasn't got a cat so from turbo back it has downpipe with cat and cat pipe with cat which you just decat then you just need to decide if you want a sports cat for mots etc or decat for the the downpipe.

bob r

iTrader: (46)

The car was standard when I bought. I then added in the following order..

.Free flow panel filter
.Centre(short) decat pipe to replace the centre cat.
.Blitz exhaust. Backbox and cetre to mate up to the above decat pipe.

The above was done by me...really staright forward. The car runs fine without any issues with these mods and doesn't need a map at this stage.

A few months later after sourcing the parts I added the following.

.Genuine Prodrive sports cat downpipe (from turbo to centre decat pipe)
This was fitted professionally for £90
. Geuine Prodrive uprated fuel pump. Fitted by me, again quite straight forward.

With the above done, I immediately rang around for a remap (same day) and got it booked in within 5 days

The car ran ok but I drove off boost as much as poss as the fuelling would have been all to ****. (until remapped)

Powerstation did the map and the results were fantastic.

Skooby53

iTrader: (1)

I have to agree, I did my filter exhaust and then had a re map done 3 months later, Christmas got in the way! Mine is a MY99 so a little different, however, the mapper I chose recommended the changes before the session. Just take it a little easy until its mapped.

Clarkie172

thanks fellas, thats what I will do I think. With the panel filters, are the standard sti ones better than aftermarket? on scoobyworld an aftermarket one is around £35 and an sti one about 85??

Skooby53

iTrader: (1)

You will be opening a can of worms with that question The Sti filter is good, I use a KN it cost around £40 and is re usable, or at £40 just throw it away and buy another, the choice is yours. The green filters are around the same price but are not re usable. Really any of these will do the same job

Clarkie172

same job as an sti one? Im reading the argument now lol

Skooby53

iTrader: (1)

What I mean is that all the above will give better air flow than a standard impreza filter. The Sti filter is better than a standard filter a KN/Green filter is also an improvement on a 'standard' filter. In my opinion an Sti filter and the KN/Green filter will offer the same amount of improved flow. The only thing you need to decide is how much you want to pay for the one you choose i.e. £85 for an Sti or £40 for a KN.

Clarkie172

Dont I have an sti one on my sti?lol

Skooby53

iTrader: (1)

Yes you do So when you come to changing it prior to mapping, if you have not done so already, you can then make your choice. This is where the 'can of worms' comment came from. Many owners use KN or Green, there are however quite a few who swear by the Sti item. I would recommend a KN from my experience as I use one in my classic and it produces 281bhp and 312 lb/ft and I am very happy, for now

There was a post on here recently, do a search and read the comments left on there.

c_maguire

I will never be able to understand why anyone would consider using any kind of air filter that requires oiling on any car that has an air flow meter in the air intake. Why risk causing contamination of the air flow meter which can lead to innacurate readings for which is (with panel filters particularly) questionable gains anyway? Your standard STI filter (and standard filters for all models) will not require oiling. It's a service item, if it's dirty just replace it with another. Whereas the exhaust will make a huge difference, now that makes sense.
Kevin

Clarkie172

anyone used the afterburner panel filter? Its just theyre offering a free one with exhausts?

c_maguire

Virtually all aftermarket ones are oiled. If you want to flow more air then the filtration has to suffer. To overcome this oil is used so that small particles (the ones that might now make it through to the intake) stick to the filter mesh. The less oil you use when you prepare the filter the less likely you are to contaminate your air flow meter but then more 'dust' is likely to enter the engine. Prodrive used to fit a RamAir panel filter as part of their performance pack but on the 99/00 cars (which do have a sensitive air flow meter) they retained the standard filter. I called them as I have a MY00 car and their technical department said that replacing the panel filter in the standard box made no discernable difference anyway on any models and was more a selling tool than anything else (pay for a performance kit and most people expect to get a different filter).
Kevin

dunx

iTrader: (3)

My STI was perfectly happy with a catted exhaust for nearly two years before I had it re-mapped....
Just wasted about 50 bhp as it still used the fuel, but not efficiently !
No boost spikes or other problems.
Added a fuel pump and new plugs for re-map and got 340 bhp.

HTH

DunxC

Clarkie172

is it only really when u take the cat out it needs remapping? I might change centre section and back box for the time being

bob r

iTrader: (46)

Read my post above.

Clarkie172

so yours was fine with centre/back ans with one cat taken out!