ExhaustPost your questions and suggestions about stock or aftermarket exhaust setups. Third Gen exhaust sound files and videos!
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i've read a few posts recently where people changed their exhausts, couldn't get their cars to run right and put more restrictive cats on their cars to correct.
i'm guessing the problem they're having is that the exhaust is evacuating so quickly that the o2 sensor isn't heating up to operating temps.
wouldn't a better fix be going to a heated 02 sensor? i remember reading an article about a ram jet 350 install in a street rod. the 02 sensor mounted much further back in the long-tube headers than stock and didn't work right. they corrected the problem with a heated sensor.
i've just sent my slp 1 3/4" shorties off to jet hot to be coated. i'm running them to dual random technology 2 1/2" cats into a 3" pipe to the muffler out to dual 2 1/2" outlets.
i still need to decide on which o2 sensor and which muffler to use. i'm tired of the "flowmaster sound" and am leaning towards a magnaflow.
looking for suggestions.
__________________ 1989 WS6 Formula Firebird T-Tops
L03 305 TBI 5 speed
SLP takeoff 3.42 posi rear (was 3:08 open)
Ultimate TBI mods
1/4" injector pod spacer
MSD 6A ignition (switched back to stock, AC/Delco distributor, coil and wires and picked up 3hp!)
'84 Trans Am functional cowl induction with K&N element
SLP 1 3/4" shorties w/air
Dual 2 1/2" converters
Custom 3" cat(s) back
Flowmaster 40 series muffler
Spohn weld-in subframe connectors
Lakewood control arms
Hotchkiss adjustable panhard bar
KYB shocks and struts
170 rwhp, 263lbs. ft. torque
best 1/4 mile: 15.62 @87 mph
I have a very free flowing exhaust (1 5/8" headers, 3" collectors, 3" center in/out aerochambers and 3" pipe the whole way) and I've never had a problem with my o2 sensor, but who knows it could just be a FI thing...
I have slp 1 3/4's, a 3 inch pipe for a cat and a 3 inch single in/out flow cat back on the 87 car. I've drove it nearly every day for a year and a half (about 15,000 miles) with the same regular O2 sensor and hav'nt had a problem yet. The last long trip I went on I clocked it at 25 mpg.
