de-cat make a diffrence ?
07 February 2009, 11:51 PM
#5
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seen as though it restricts the hell out of the car then erm...yep
good for nigh on another 40hp. You might need map looking at or tweaking to get it running optimumly though.
good for nigh on another 40hp. You might need map looking at or tweaking to get it running optimumly though.
08 February 2009, 12:01 AM
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ive not long bought the car and had a look underneath today, it looks like a pipe straight from the front to a back box. no other boxes in between . cheers
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08 February 2009, 12:18 AM
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its just a thick chrome pipe from memory. i just had a look at a receipt i have here. it says "classic impreza open mouth downpipe £164,25" . which was bought 4 month ago. ill have a another look tomorrow but im sure it is a decat
08 February 2009, 01:44 PM
#12
... At that price it sounds like an ebay special, but no bother: still just a mandel-bent bit of T304-grade s.s. 
Best to get it mapped for, to realise optimum spool, performance, safety...
Last edited by joz8968; 08 February 2009 at 01:51 PM.
08 February 2009, 02:23 PM
#14
It will invariably fail. 
I personally take mine to Zen who have a OEM catted downpipe, pre-bolted up to a quiet system, that they just swap out for the MOT (using Ford RapidFit right opposite their premises, over the road!)
Okay, it costs about £40 extra every year for the labour to swap in and back out again, but is a small price to pay IMO for extra performance and spool from a mapped decat downpipe.
I personally take mine to Zen who have a OEM catted downpipe, pre-bolted up to a quiet system, that they just swap out for the MOT (using Ford RapidFit right opposite their premises, over the road!)
Okay, it costs about £40 extra every year for the labour to swap in and back out again, but is a small price to pay IMO for extra performance and spool from a mapped decat downpipe.
Last edited by joz8968; 08 February 2009 at 02:24 PM.
08 February 2009, 02:57 PM
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just looked at it , and it is a de-cat. as for the mot time ive got that covered so don`t need to get a cat. spoke to a mate of mines who is a mot tester and said he would pass it for me if its the only problem. cheers
08 February 2009, 03:21 PM
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So how do you get a standard sti from 265 to around 320 then?
de-cat inc downpipe etc
fuel pump
remap
Genuine question.
On my mates Evo his downpipe being removed and replaced gave him an extra 30hp or therabouts.
08 February 2009, 04:18 PM
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08 February 2009, 04:28 PM
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Mine ran quite well with the sports cat on up to 360.....when the 400 upgrade was carried out we found that the very same sports cat began to suffocate the car. As soon as the sports cat was removed and running on full decat, my scoob became a different animal! Ofcourse the sound of the exhaust was a tad louder!
08 February 2009, 05:21 PM
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mines a 97wrx on a R reg. Jap import. Should it have 2 or 1.
Ive managed to source an old Magnex 6x4 with a decat, and wouldnt mind it.
I hear they do and dont pass mot without the centre cat on, someone said to take it for a long run before mot get it nice and hot, but im prepared to have it fitted for mot to be honest, not the end of the world is it.
Ive managed to source an old Magnex 6x4 with a decat, and wouldnt mind it.
I hear they do and dont pass mot without the centre cat on, someone said to take it for a long run before mot get it nice and hot, but im prepared to have it fitted for mot to be honest, not the end of the world is it.
08 February 2009, 06:35 PM
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hey folks!! yeah i bought my 95 import wrx with no cat and it failed at mot time so i just welded one in. but there is a fair difference in power and spool up with one in. so mines is coming straight back out lol