De-Cat?
#1
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Join Date: Apr 2003
Location: Aviemore, Scottish Highlands
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Im looking to put a de-cat on my MY96 sti import.
Ive been told to get the most power to remove both cats. If i just remove the rear cat what would the benifit of this do?
Is there any thing that i should know about before getting this done?
MOTs are not problem!!!
What about the sensors?
If any one can help it would be great.
Ive been told to get the most power to remove both cats. If i just remove the rear cat what would the benifit of this do?
Is there any thing that i should know about before getting this done?
MOTs are not problem!!!
What about the sensors?
If any one can help it would be great.
#4
Wiggy, I can't confirm whether or not there is a centre cat, as I don't think I've ever seen a standard exhaust on an early scooby.
As for what to change... Figures I've heard are 5-15 BHP for removing the centre cat, and 15-25 BHP for removing the downpipe cat. - Most dealers quote upto 35 BHP for a full de-cat system.
Apart from BHP increases there will also be a torque increase, exactly what can differ hugely. The torque will normally peak lower in the rev range, and the turbo will spool up quicker.
As an example...
I had a blitz induction kit, standard boost, blitz centre and back box. When I removed the front cat (for a magnex twin dump), I gained 23 BHP, and somehow got another 36 ftlb of torque (although my original reading seemed a bit low)
My friend also had 305 BHP on his STi as standard, and when fitting a Blitz NUR Spec exhaust with a Scoobysport downpipe, gained exactly 35 BHP taking it up to 340BHP With no other mods, recorded on the same day I think.
And as Kevin says:
As for what to change... Figures I've heard are 5-15 BHP for removing the centre cat, and 15-25 BHP for removing the downpipe cat. - Most dealers quote upto 35 BHP for a full de-cat system.
Apart from BHP increases there will also be a torque increase, exactly what can differ hugely. The torque will normally peak lower in the rev range, and the turbo will spool up quicker.
As an example...
I had a blitz induction kit, standard boost, blitz centre and back box. When I removed the front cat (for a magnex twin dump), I gained 23 BHP, and somehow got another 36 ftlb of torque (although my original reading seemed a bit low)
My friend also had 305 BHP on his STi as standard, and when fitting a Blitz NUR Spec exhaust with a Scoobysport downpipe, gained exactly 35 BHP taking it up to 340BHP With no other mods, recorded on the same day I think.
And as Kevin says:
Go for a full TSL system with there Firestorm backbox, you'll love it.
Pops and bangs all the time.
Pops and bangs all the time.
#7
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Join Date: Apr 2003
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Cool.
Been quoted £250 for both cats and a replacement fiting for the Lambda sensor by Powerflow. They can have it done in an afternoon. Thot that was rather good.
Been quoted £250 for both cats and a replacement fiting for the Lambda sensor by Powerflow. They can have it done in an afternoon. Thot that was rather good.
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