Krister Posted April 21, 2009 Share Posted April 21, 2009 Anybody punch a hole in the 1st decat to make it a "decat pipe" I noticed 2nd decat pipes on Ebay for £89 so this would be a great budget setup. Opinions? Quote Link to comment Share on other sites More sharing options...
Scoboblio Posted April 21, 2009 Share Posted April 21, 2009 I asked about this many years ago, I wanted to do much the same thing as a 'stealthy' way of doing a decat. General opinion was that the exhaust gasses wouldn't flow very well through a gutted cat as it's not a straight, consistent route. I thought about opening it up and welding a pipe through the middle to get around this, but at that point the need to do it vanished (ie I changed insurers ). Quote Link to comment Share on other sites More sharing options...
uk-rich Posted April 21, 2009 Share Posted April 21, 2009 i did this once, what a ball ache, and it resonates like a bitch, not reccomended Quote Link to comment Share on other sites More sharing options...
paul mac Posted April 21, 2009 Share Posted April 21, 2009 i did this once, what a ball ache, and it resonates like a bitch, not reccomended yeah that, my mate did it on his 300zx and the car sounded awefull, i think he had performance issues as well IIRC Quote Link to comment Share on other sites More sharing options...
Rinus Posted April 21, 2009 Share Posted April 21, 2009 I am driving like this for 3 months now, doesn't resonate, have 2nd decat hks and 4" hks catback, and without restrictor ring its steady on 1 bar, so empty first cat is still a bit restrictive, but a lot quicker then a full cat ordered a complete new exhaust btw, japspeed exhaust and first and second decat, so will need 1.2bar restrictor ring.. Quote Link to comment Share on other sites More sharing options...
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