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Before anyone starts flaming...I have tried searching for everything and anything to do with CAT and found NOTHING that can answer my question.
So, with that said, here's my question...
Would removing my main CAT with a straight pipe increase performance?, and if so, by how much?
I believe my CAT is failing, as I have black smoke coming fron the exhaust when I stomp on the gass and the peformance of the car has decreased. I read in an Import mag that they removed the CAT for a straight pipe on a Eclipse GS-T and it gave an increase of 27.1Hp on the Dyno!!! WOW!, now I know that the appilcation is totaly different as it's a turbo and mine's not obviously. But it got me wondering.
I know this is totaly illegal to do also, but what the hell. I just got smogged and have a replacement CAT that I can put on next year etc, Will it be that much louder without the CAT? (I also have the Res removed with a straight pipe) and what about smell or smoke increase?
ANY help on this topic would be greatly appreciated! Thanks.
Simon W. Las Vegas.
96 SE V6 MTX Tereador Red (1st Blown Engine, better be the last!)
1999 SVT Engine
SVT Exhaust w/custom DTM Tips and optimized Y-pipe and no Res (thanks to Po-Jay!). LSD Quaife(thanks to Terry!), SCA CAI w/KKM, Grizzly clutch, FMS 9mm wires, Airknights custom short shifter.
"You can only get more rice at one time by ordering Chinese" - Davo7SVT
"it's only nuts and bolts" - Terry Haines
"Drive it like you stole it" - Me!
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Joined: Oct 2000
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i dont see it being more then a few hp, not 27 by any stretch. i have also heard about people losesing power.
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Joined: Mar 2001
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So does anybody know the penalty of not running with a cat. I know here in California they are really strict but is it a huge fine or what?
Silver 98 SVT Contour E0 #4124 (Currently on Life Support) Built 11/97 Bought 1/98 Eibach Pro Kit \ Koni \ Niche Pultec 17"x7.5 \ Yokohama Parada 215/17/40 \ Shaved Wheel wells / Brembo-KVR Cross Drilled Rotors / KVR Carbon Fibre Brake Pads / Aeroquip SS Brake Lines \ 21mm Rear Progress Tech. (Powder Coated Black) \ Superchips Auto Meter Pro Shift Light \ Extrude Honed \ Stripped Resonater Street Scene Free Flow Exhaust \ Injen Technology Prototype CAI \ Weapon R filter \ Hose Techniques Red Kit \ Folia Tec Red Caliper Paint \ MOMO (shift knob, pedals, seat belt pads) \ Clarion, Sounstream, Kicker \ Optima Red Top Battery \ SVT Emblem Mods Jet Hot Coatings (25-30% Cooler) on Upper Intake Manifold, Sho Shop Y-Pipe, Cat, and CAI "Come Out...Come Out Where Ever You Are" http://www.geocities.com/speeddemons19
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Well in FL its a $500 fine and a 1st or 2nd degree misdemeanor charge. Plus, mechanics can be fined $2,500 for removing your cat illegally, so u might have a hard time finding a shop that will do it for ya. So if California is more strict....i personally wouldnt risk it just to gain a few horses. Just buy a performance hi-flow CAT if you want the OEM one gone.
98 Merc. Mystique LS
Red Wings and US Soccer 0wn j00!
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OUCH! I think I might give it a miss and just put on the CATCO I just bought to replace it then. Does anyone know if welding is involved or can it be a straight bolt on application? It is the exact size as my OEM one, 2" IN/OUT's.
Simon W. Las Vegas.
96 SE V6 MTX Tereador Red (1st Blown Engine, better be the last!)
1999 SVT Engine
SVT Exhaust w/custom DTM Tips and optimized Y-pipe and no Res (thanks to Po-Jay!). LSD Quaife(thanks to Terry!), SCA CAI w/KKM, Grizzly clutch, FMS 9mm wires, Airknights custom short shifter.
"You can only get more rice at one time by ordering Chinese" - Davo7SVT
"it's only nuts and bolts" - Terry Haines
"Drive it like you stole it" - Me!
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Joined: May 2000
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Hey just take a look at my sig and ask me some questions if ya got some.
Merlin
281hp 324tq
Timing 14' FP 36,24lbs,190lph,75Maf,65tb,cobra upper&lower,B303, GT-40 Crate with X al heads, Mac shorties, Off Road H,2chamber Flow's dumped, Tokico 5wys, Hotichkis Ctrl Arms, Alum Drive shaft, 3.73, Sub Frame,Steeda Tri-Ax, 94 Seats Drivers side powered.
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So does anybody know the penalty of not running with a cat. I know here in California they are really strict but is it a huge fine or what? my buddy got caught w/ out cats on his stang and they fined him $2500 and inpounded his car on the spot.
Proud former owner of.....
'99 svt - silver/blue - #2555 of 2760
Proud new owner of...
'02 BMW 330i
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Joined: Aug 2000
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Chrisvt, how did it happen?
'99 Cougar V6 5spd - I/H/E, Koni/GC
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On a modified talon if they removed the first cat (in the downpipe) they could see 20HP. This of course means the installing a 2.5 or 3" mandrel downpipe. Speeding exhaust velocity away from the turbo will drastically reduce turbo lag and significantly jump HP.
Also I could see them gaining 10HP from cat removal as a large straight through exhaust is very benefitial on a turbo charged (or any forced induction) engine.
On this engine. I'd say a few peak HP and the car will get a little tinny sounding at startup. Goes away when the pipes warm up.
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Joined: Aug 2000
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he got caught in a check-point on a local cruise strip. they heard him coming and asked him to pull off the road and drive up a ramp and well...they saw that all 4 cats were missing. he was just running 2 two chamber flowmasters.
Proud former owner of.....
'99 svt - silver/blue - #2555 of 2760
Proud new owner of...
'02 BMW 330i
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