I need a make, model, year, or any other info so I can order the correct and complete setup for that year. I have SLP headers and want the year and model info so I can order the correct cat adapter. I also need to order the correct cat for that year so the SLP kit will work easier. This is for a 3" flowmaster single in/out exhaust or possibly dynomax if they do make a true 3" setup (not a 2.5").


James

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1985 Z-28 305 TPI
221,000+ mi., Original Eng.

 

no years came w/ a 3" cat, you have to order a 3" cat and tell them what kind of adapters you're going to have on each side of it.

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1986 Z28 LG4 M5
Alpine 6x9's 2 10" MTX Thunder 4000's MTX Thunder 102 Amp Hooker Aero-Chamber Cat-Back

 

My car has (had) a 3 inch cat.

 

If I'm right most CAT's was like mine which is 3"in / 2 1/2" out. I found this out when I had a was in the process of removing my CAT. I measured the inlet and it was 3" and it lookes the same at the outlet. I cut off the CAT and whent to install the pipe I had made 3"in / 3"out and then discovered it was too big. I had to have another pipe made which was 3"in / 2 1/2"out. Fit perfect. The muffler shop said the Maufactures do this in order to keep people from just sticking in a piece of pipe in there like I did. HAHA! Mine was factory exhaust tho.

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'87 Trans Am:
(Engine)
305 TPI
180 Degree Thermostat
JET Fan Switch
TB Bypass
Accel 300+ 8.8 Racing Wires
Accel Super Coil
Bosch Platinium Plugs
Custom Ram Air with K&N
Removed Emissions Equipment & Cat.
(Stereo)
Full Kenwood Excelon System

[This message has been edited by jobryan26 (edited April 16, 2001).]

 

I think 88-89 L98 cars came with 3in cat. Not completely sure but I know they did come factory.

 

Orginal owener of 1987 lb9 305 and it has a Cat with a 3" in & out to the 3" pipe to the
muffler with 2 1/2 exhaust. This is Stock.
Also, I just installed SLP 1 3/4 Headers and
used the 3" slip fit pipe from SLP. Just in case you question the header size, I just put
in a 350.

 

my 1989 LB9 irocz came with an 3". no documents shown that it was an aftermarket.

 

Well, they look 3", and the pipes going in and out of the cat are 3", but on the I-pipe side it necks down to a little over 2 3/4" for where the I pipe mates up at. Aftermarket 3" I-pipes still bolt to it... I believe that is officially the 3" factory cat on most 305 and 350 TPI single cat cars... That's what both my 86 and 87 305 TPIs had originially.

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Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray