I have a 2005 wrx blobeye. standard apart from a pipe from the rear cat. how can i get 300bhp? and how safe is it!? in terms of putting that power through the gearbox etc

 

Get an STi PPP

simples!

 

quickest way buy one thats already 300 j

 

I went for 550's, 16g td05, 255l fp, and a 3 port , then a ecutex by jgm and made 331/329. your gear box is good for 400hp going by Andy f and thats what i'll be going for next

just get it done

 

That would have to be a Hawkeye to get 300. PPP cars rarely make the quoted bhp in my experience ( 2 cars). I have now gone down the decat / remap route with far better results

 

If you're brave enough to put 400bhp through a newage WRX 5spd box and use it in the manner a Subaru is meant to be used i sincerely hope you have some savings because you will be needing a new box or rebuild in due course.

There's a reason why both WRX engines and gearboxes aren't recommended to go over 330-350bhp/Torque...because they're not built for it.

An STi V7-V8 engine will take 500bhp+ at push and 400bhp+ all day long on std internals. A standard 2.5STi won't take even 400bhp all day long because they're not as strong as the 2.0L engines, although all 6spd STi gearboxes will take over 600ft/lb on std internals. Why?...because they are over engineered for it.

I'm putting 350/360 through my 5spd box and it's seriously creaking under the strain as are many other 5spds i know of making similar power/torque to mine. It's just a matter of time before it goes bang and i accept that but 400bhp is a bit over optimistic IMHO.

I know people with 5spd PPG internals in their boxes and they still go bang, which is why a fair few time attackers use std 6spd boxes with the first 5gears from a JDM STi box and a UK std 6th gear.

A 6spd is the way to go and is plenty strong enough for most of us.

 

Ok. We accept that 400bhp is a bit much for a 5 speed to handle, but back to the OP's more reasonable 300bhp....

If you decat the whole exhaust (or put in a sports cat for legality) and a good remap could see 280-290bhp.

To get to 300+, you need bigger injectors and a bigger turbo and an uprated fuel pump.

 

my opinion, tdo5 (front entry converted) sti pink 550cc injectors sti topmount
decat up-pipe (any off of a classic will do) and depending on where you live get Andrew Carr to open source map it, you will have over 300/300 and a nice drivable car to boot, job done