My car right now has a 3 inch pipe coming back off the cat but when it goes into the muffler it somehoe changes and the 2 tips coming out of the muffler are like 2 1\4 is there a reason why the guy that use to own my car done that and would there be much of a difference in performance if i went 3 inch the whole way back?also will a camaro exhaust off the newer 4th generation camaros fit on a 3rd generation?

More than likley there's an adapter to make the change from 3in to 2 1/4th. If not it's the straight 3in over the 2 1/4 muffler inlet. If it is the stock Muffler. Advantage is back pressure. Helps for low end Tq, not high end though! Also it's coming out dual soo... you really have a 4 1/2 exhaust out of the muffler. But you only have 3in from the cat to muffler... Also then from the exhaust manifold to the cat/y pipe.


However it shouldn't hender performance that much.. if anything go to a 3in all the way.. More than enough and may be too much...


Not sure about the 3rd to 4th swap or 4th to 3rd

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92 Camaro 305 TBI Automatic
https://www.thirdgen.org/rides/index...ew&rideid=6100

ya, the 2 1/4 tips wont hurt u any, as 92 camaro said.. heck, look at the stock y-pipe, (or t pipe ) the drivers side is alot smaller then where the two sides connect and smaller then the rest of the exhaust.

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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series Muffler added to Unkown CatBack, Ported Intake

http://www.geocities.com/david_angel_16

Assuming the 2-1/4" and 3" dimensions are OD, and pipe wall is 1/16" for each, dual 2-1/4" pipes will have a flow area of 7.09 sq in., while the single 3" will be 6.49 sq in. So, the dual 2-1/4" pipes aren't going to hurt a 3" system (assuming boundry layer losses in the 2-1/4's doesn't cancel out the greater flow area).

4th gen style exhausts are available for 3rd gens, but 4th gens won't fit directly.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4, 2300 stall TC. Ported World 305 heads, Crane PowerMax 2050 cam. ZZ3/4 intake, oil pump, pan & baffle. Accel HEI SuperCoil & module. Hooker 2055 headers, 3" Catco cat & 3" catback w/dual-opposite Flowmaster 80. 2.93 limited slip. Spohn SFCs waiting to be installed. AMSOIL syn lubes bumper-to-bumper. Daily year-round driver. Best ET, speed TBD...
57 Bel Air, my 1st car. '66 396, 9.7:1 forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 700 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).