gutting stock cats
anybody sell cat stickers, like the ones on random tech. that are stickers on the outside that say random cats? or something close that may deter inspection guys from taking that extra look?
TECH Senior Member
Joined: Apr 2004
Posts: 6,157
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From: Texas
Originally Posted by wvaboy
anybody sell cat stickers, like the ones on random tech. that are stickers on the outside that say random cats? or something close that may deter inspection guys from taking that extra look?
Yeah, I bet that would throw em off.
I was gona gut my stock cats. But later got LTs and truduals. The passenger side seemed like it would be easier to do but the driver side seemed to be more difficult. I seen a kit awhile ago with some flanges that bolts right up to the stock manifolds so that you can run no cats. I dont think its worth it for the price tho.
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I have a pair gutted ,fit 00-02 will take 50.00 + shipping, but you are going to get SES lite , unless you get sims or have it tuned
PM me if you like , or call 409 385 5273 Johnny
PM me if you like , or call 409 385 5273 Johnny
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Best bet is to get a long (>1 ft) drill bit, and chow out
some starting holes. Until you make some starter cracks
the ceramic is surprisingly tough. Once you riddle it with
holes though it busts up easily.
Some people say gutted cats make rasp. I found there
are several sharp edges where the tube lies inside the
flange that look like they have dog-whistle potential.
I dressed mine smooth with a burr and have no rasp,
just a nice exhaust note (through SLP CME which is a
pretty quiet exhaust). A little boomy at 2-3K which I
think may be the resonance of the cat-shells.
Gutted cats have roughly 1/2 the pressure drop@flow
of stock cats, worse than offroad tubes and better
than the RT high-flow (2.5") big-body cats.
I have looked at putting an inner pipe into them;
this looks difficult due to the bends. But getting a
pair of stainless tubes bent to jig, and MIGing on a
pair of cat-shells and the flanges, would be nice
and not-too-noticeable. Unless they use an IR
camera and know what they're doing.
some starting holes. Until you make some starter cracks
the ceramic is surprisingly tough. Once you riddle it with
holes though it busts up easily.
Some people say gutted cats make rasp. I found there
are several sharp edges where the tube lies inside the
flange that look like they have dog-whistle potential.
I dressed mine smooth with a burr and have no rasp,
just a nice exhaust note (through SLP CME which is a
pretty quiet exhaust). A little boomy at 2-3K which I
think may be the resonance of the cat-shells.
Gutted cats have roughly 1/2 the pressure drop@flow
of stock cats, worse than offroad tubes and better
than the RT high-flow (2.5") big-body cats.
I have looked at putting an inner pipe into them;
this looks difficult due to the bends. But getting a
pair of stainless tubes bent to jig, and MIGing on a
pair of cat-shells and the flanges, would be nice
and not-too-noticeable. Unless they use an IR
camera and know what they're doing.
On the tree
Joined: May 2004
Posts: 643
Likes: 0
I had my local shop just cut the flanges off of the cats and weld and bend some pipes to fit back in place. We dont have any type of inspections here though. The car does have a raspy sound now though. I have a flowmaster 80 2 chamber and the SLP Y pipe on the car with stock manifolds for the moment. I am thinking of doing Mac midlengths, ORY, and the GMMG cat back for the next system.
Originally Posted by boondiggys
i heard of the mustang guys running off road h pipes then just tacking the heat shield back over the pipe to throw them off...maybe you could rig something up
) and even found some cylindrical ducting from Home Depot that could possibly pass for cats if worked into place just the right way. 
