Will a 3inch X-force dump pipe with 3inch cat coming off from an 04 WRX fit on a MY99 Sti with cat back HKS Hi-power with a VF28.

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STi Version VI

It will, with some tweaking.

You may have steering rack clearance issues and you'll have to check the pipe lengths too.

what sorta tweaking are we talkin... costly?

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STi Version VI

More than likely cutting and welding, so however much that costs per hour will be your expense.

Asked the same thing on rexnet..

some dude said

"Not sure if all the XForce's are the same but i just pulled one off a customers car (to replace with an AVO dump pipe) and the join was in a different spot to factory. The XForce bellmouth was also considerably smaller than the turbo housing."

will the housing and the bellmouth bit be a problem? getting some pics soon...mayb they will help the technicians to decide here?

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STi Version VI

Depends how the dump pipe is made....I know for a fact that some X-Force ones aren't a full bellmouth, they still have a small blanking plate in the dump.

It will fit just fine, but it won't flow quite as good as a full bellmouth.

Get some pics and we'll decide.

Heres the dump and cat. Dont know the actually length to it, but this is the site i was told to go to http://www.xforce.com.au/cars/view_car/10

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STi Version VI