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July 15th, 2006, 09:56 AM
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Hi flow cat ?
I am purchasing a 87 GN and it has a test pipe on it. The car has a 3" down pipe and a test pipe with a flange on the rear of it connecting it to the exhaust system. I live in NJ and will need to have the car pass inspection and in NJ they will stick a sensor in the tail pipe to check the emissions. With all that said I have heard that there is a Hi flow[IMG]test pipe[/IMG] cat available that will directly fit an exhaust that has a 3" down pipe and will bolt directly to the exhaust flange. Do you guys know who makes it and where I can find it on line. Any help will be greatly appreciated. I attached a picture of the test pipe.
Thanks Dave     
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July 15th, 2006, 10:45 AM
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Kirban sells a stock replacement cat and also one for the 3" DP. Check the catalog.
http://www.kirbanperformance.com/ 
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July 15th, 2006, 11:16 AM
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Where are you in Jersey? I have an almost new high flow cat used just a few times.
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M&A alum. Heads; Eastern Perf. frt. mnt. intercooler; TE-63 Turbo; Burhead Headers;Hooker exhaust; Kenne-Bell intake; Accufab TB; 55lb. Injectors Spread the word ClintonSucks.org
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July 15th, 2006, 12:19 PM
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Measure your test pipe, it's probably around 14 1/4" long at least thats what my ATR test pipe was. I bought a 3" Hi flow cat from Kirbans, problem was I had to cut back a little of the exhaust to get it to fit in because the new cat measured 18 1/2" from Kirbans. There are other Hi flow cats out there measuring around 14" or so. If I would of known that at the time I ordered mine it would have saved me the trouble cutting back the exhaust to get it too fit in place.
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1987 GN 3" ATR downpipe,PTE TA 49 turbo, adj. wastegate,adj. fpr. Art Carr shift kit 2 1/2" Hooker ex. 3" Hi flow gutted cat, aero chamber muffs. 9"K&N filter, 60/65lb. mototron injectors,heads pocket ported, 3 angle valve job, LT1 valve springs, 340 walbro fp.hot wired, plenum spacer, 160 therm. cross drilled slotted rotors, vacuum brake conv. Kirban GNX style rims,48k on car, 93 Turbo Tweak chip, 2.1 scanmaster,knock guage, 3" LT1 Maf w/translator, VDO guages,manual boost controller.
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July 15th, 2006, 02:38 PM
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Thanks for the heads up Turbojd. Do you know where I can get a shorter HI Flow Cat that would measure around 14" ? When I get the car I will measure the Test pipe before I buy a Cat. Do you think keeping a cat on will kill performance? If so I will put it on just to pass inspection and then put back the test pipe. Why did you cut the exhaust insted of cutting the cat?
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July 15th, 2006, 02:52 PM
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njbadboy, you could try http://www.randomtechnology.com part#923007 Hi-flow 3" cat for an 86-87 GN with a 3" downpipe. HTH
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1987 GN 3" ATR downpipe,PTE TA 49 turbo, adj. wastegate,adj. fpr. Art Carr shift kit 2 1/2" Hooker ex. 3" Hi flow gutted cat, aero chamber muffs. 9"K&N filter, 60/65lb. mototron injectors,heads pocket ported, 3 angle valve job, LT1 valve springs, 340 walbro fp.hot wired, plenum spacer, 160 therm. cross drilled slotted rotors, vacuum brake conv. Kirban GNX style rims,48k on car, 93 Turbo Tweak chip, 2.1 scanmaster,knock guage, 3" LT1 Maf w/translator, VDO guages,manual boost controller.
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July 15th, 2006, 02:56 PM
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Sorry when you click on the link click on under products on the top of the page for direct fit Hi-flow cats, not universal cats.
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1987 GN 3" ATR downpipe,PTE TA 49 turbo, adj. wastegate,adj. fpr. Art Carr shift kit 2 1/2" Hooker ex. 3" Hi flow gutted cat, aero chamber muffs. 9"K&N filter, 60/65lb. mototron injectors,heads pocket ported, 3 angle valve job, LT1 valve springs, 340 walbro fp.hot wired, plenum spacer, 160 therm. cross drilled slotted rotors, vacuum brake conv. Kirban GNX style rims,48k on car, 93 Turbo Tweak chip, 2.1 scanmaster,knock guage, 3" LT1 Maf w/translator, VDO guages,manual boost controller.
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July 15th, 2006, 07:20 PM
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just a quick question , does it have the 2 1/2 inch outlet to fit up to stock exhaust? looks like it may be 3 in and out.
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July 15th, 2006, 07:29 PM
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Random Technology has one listed for an 86-87 GN with a stock 2 1/2" downpipe part # 922507
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1987 GN 3" ATR downpipe,PTE TA 49 turbo, adj. wastegate,adj. fpr. Art Carr shift kit 2 1/2" Hooker ex. 3" Hi flow gutted cat, aero chamber muffs. 9"K&N filter, 60/65lb. mototron injectors,heads pocket ported, 3 angle valve job, LT1 valve springs, 340 walbro fp.hot wired, plenum spacer, 160 therm. cross drilled slotted rotors, vacuum brake conv. Kirban GNX style rims,48k on car, 93 Turbo Tweak chip, 2.1 scanmaster,knock guage, 3" LT1 Maf w/translator, VDO guages,manual boost controller.
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