Replace Cat with drilled Straight Pipe
12-11-2003, 07:30 PM
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Replace Cat with drilled Straight Pipe
I don't want to get a new exhaust b/c all my money has been spent for x-mas. I have been thinking about cutting my cat out of the car and replacing it with a straight pipe which i'll drill holes into to help the backpressure. Do you think this will be okay? I have a OBD1 D16Z6
12-11-2003, 07:59 PM
#2
Re: Replace Cat with drilled Straight Pipe (Del_Slowest)
cut holes to reduce back pressure? what are you talking about exactly, a perforated tube like inside a muffler or resonator?
12-12-2003, 02:59 AM
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Re: Replace Cat with drilled Straight Pipe (matt_sb2000)
You really think it'll be just as loud? My main goal is just to make it look like it's hooked up since we have **** cops that like to check loud exhausts. Has nobody ever done this before?
12-12-2003, 05:55 AM
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Re: Replace Cat with drilled Straight Pipe (shermanyang)
I figured since i have a open downpipe right now and i don't throw any codes then why would it hurt it to free up some exhaust pressure by removing the cat and throwing in a drilled section of pipe. You really think it'll make the car slower? I thought it would actually help the turbo spool up faster but i could be wrong 
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12-12-2003, 05:59 AM
#8
Re: Replace Cat with drilled Straight Pipe (Del_Slowest)
if you're gonna throw on a full exhaust with a test pipe, a drilled test pipe will interfer with the current of the exhaust flow. now if you're gonna just run a drilled test pipe and no exhaust...i don't think it'll do anything at all.
if you've ever had a hole in any part of your exhaust, you'll know what i'm talking about.
if you've ever had a hole in any part of your exhaust, you'll know what i'm talking about.
12-12-2003, 06:21 AM
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Re: Replace Cat with drilled Straight Pipe (shermanyang)
If your running open exahust now you better check and make sure you even have a bulb in your check engine light spot. When you turn the car on does it come on and go back off?
12-12-2003, 08:17 AM
#10
Re: Replace Cat with drilled Straight Pipe (RedTegLS)
He's OBD1 so why would any kind of exhaust modification after the O2 set a CEL? anwser - it woulden't. You can do anything you want after the o2, ECU won't know the diff. Sounds like a cutout might be a little cleaner setup but 1" holes will act the same way just with a little more turbulance
12-12-2003, 11:53 AM
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Re: Replace Cat with drilled Straight Pipe (Bailhatch)
Ahh, your right. Those E-cutouts are pretty sweet. I like the one mistabone made the best though with just the plate with the wingnuts. Looks like i have some welding to do, thanks for showing me the light 
12-14-2003, 07:54 PM
#12
Re: Replace Cat with drilled Straight Pipe (Del_Slowest)
Ya, good call on the old school style cutout. Thats what I'de get if I did one. Nothing to break and you could even make it 100% in your shop either from scratch or using a 2.5 or 3" exhaust flange with studs welded or pressed in. Make it and take pics.... 
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