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Joined: Jun 2001
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i lost 7-8 mph off of my Trap speed and gained +2 seconds on the ET after i gutted the cat. I have 0 in the cat, no resonator, but i have a muffler in the rear. what would give me the most backpressure without replacing the cat? putting a cherry bomb or muffler in the middle where the resonator was? 
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Joined: Jun 2001
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a guy at midas said i should take the cat off, and weld a pipe inside of it, and put it back on... ??
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Joined: Sep 2000
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Then you get the gasses to go straight out, whereas a empty chamber might disrupt airflow a bit.
STD's are like Pokemon...
Gotta catch em' all!
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Joined: Jun 2001
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thats what he said, hes like " the gasses are just bouncing all around in the insides before it flows out, and its not making good flow which is making you slower" so... i gotta get a pipe, but what do i do for the outside edges? the pipe wont fit the whole thing....
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Joined: May 2000
Posts: 3,598
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Correct, a hollow chamber will lower exhaust flow velocity, which can possibly lower your power.
\'94 Cobra #4963/5009, black on black, not quite stock Formerly owned a black '00 SVT, #1972 Join the SVTOA! RIP - Ray "Old Fart Emeritus" McNairy
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Joined: Jan 2001
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back pressure adds exhaust velocity but putting somthing strait inside there will bring back the velocity and not add anyback pressure. I had all three cats gutted on my 95 and there was a tremendous loss of power but when I got my off road y-pipe It produced so much. .8 in my et drops same road g-tech.
98 silver frost SVT
custom built intake, offroad y-pipe,mystery mod,remote optimizer,short shifter,zex nitrous, lots of stereo, 17 konigs
with paradas.(bent) TOTALED do to freak electrical fire?(that started at a wireing harness ford neglected to tell me should have been recalled as they did with the 95se) I miss this car.
NEW PROFFESSION AS A TROLL.
new car. 2000 dodge dakota 4.7l v8. custombuilt intake, custom exhaust, kennebell pcm, and electric fan conversion, 180 stat, 3.55 pegleg, my old stereo system, 17x7 billets and 255-50 nitto 450 tires. next drop and traction adders. g-tech 14.5
in search of 95 se fivespeed to hang contourparts on.
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Joined: Jul 2000
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I was thinking about putting straight pipes where the pre-cats are, and leaving the main cat alone. Would that make a positive or negative effect on the car?
98 SVT
Black w/ Midnight Blue
Stock Rims
Sparco Pedals
Removed Resonator
TH Fix
Superwhite Bulbs
B&M Shifter
K&N Filter
KVR Cross-drilled rotors (front)
KVR Pads (front/back)
Aeroquip Steel brake lines (front)
#4248 of 6535 built
15.574 @ 88.35mph
15.814 @ 86.62mph
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Joined: Jul 2001
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What i have seena lot of people do, including my brother on his offroading beast, is take OUT the cat, and add just a straight pipe where it use to be, and then when it comes time to get a stupid E-Check, swap the pipe for the cat  seems to work really good, considering you do loose some power using the cat.
99 Grand Am GT ower LOVE FORDS THO! GO SVT seriously! MAF mod, B&M Shift Kit (no manual trans.) Lexan Intake 7" cone, Next.... Borla Exhuast, ASE Chip Reprogram. Suspension mods next summer  Just WON Ram Air Hood and Spolier! BEST TIME: Norwalk Ohio 15.216@88mph Also painted "Metal Flake Blue" interior SHARP lookin! *NEW* AED Rear Facia, Lotek Pillar guage Pod and guages!
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Joined: Dec 2000
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....or instead of putting the cat back on for the emissions test, just take your car back to the muffler shop that removed it in the first place. I'm sure they do emissions testing. They'll make it pass!
-Tim, Former crush: a '95 Contour GL 2.5L, 5-speed. Current love: 2001 Toyota Tundra SR5 King-cab 4x4.
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