Subaru Impreza wrx 2004 power mods

[Scott shepherd 1]

Hi just bought a 2004 wrx Impreza which is standard apart from exhaust and forge re circ blow off valve , I am wondering   What safe power I can get with stock internals?  And what I need to get around 280 bhp ? Thanks Scott 

[Rps 338]

Wrxs are limited by the gearbox to the 350bhp mark

To boost power you would need a better turbo and injectors along with a remap plus afew bits

If you looking for over 300bhp you better off selling and buying an sti as itll be cheaper that the cost of yours plus modding also the sti has a 6 speed box and Brembo brakes to name afew inprovements

[Charlie_89 0]

Wouldn't take a great deal to get 280HP. Exhaust 2.5 or 3inch ( sport cat in down pipe and decat mid pipe), fuel pump (Walbro 255) and a remap. You could also upgraded the y pipe for the intercooler as this could increase air flow. 

[Rps 338]

I thought 280bhp was pushing abit too much on a standard wrx turbo

[Charlie_89 0]

260 - 280hp is the best you can get from the WRX's TD04 turbo while keeping it safe.

[Scott shepherd 1]

Thanks  guys , what turbo would I need to be safe for 300 ?? I would rather be on safe side than strain the standard one 

[Charlie_89 0]

There's honestly so many options out there if your looking to reach 300hp.  A second hand STI turbo (VF 43) is a good option if your on a budget or you can get a fresh VF34 for about £1000.  

 

Here's a few links to guides regarding tuning the WRX .

 http://www.andyforrestperformance.co.uk/01-05-uk-euro-wrx/

http://www.wrxtuners.com/forums/#/topics/4007

 

 

[savage bulldogs 2,705]

If your only after 280hp a exhaust , panel filter and remap won't be far off .

If you want just over 300hp id suggest getting pink injectors and a sti or aftermarket up pipe to go with the turbo you choose.

As Your blue 465cc injectors will max at about 320hp , the tdo4 will max at 270hp and the precat in the wrx up pipe will slow spool a bit .


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