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04-15-2005, 01:13 AM
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#1 |
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Registered User
Join Date: Jan 2005
Location: Central Virginia
Posts: 22
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Nothing after the Cat, Ok, or Bad?
For the moment I have no exhaust from the cat back, is it bad to drive her without that? I know some back pressure is good, but will the cat give enough?
Thanks Sterling
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87' GMC R2500 Sierra Classic Suburban - 454 
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04-15-2005, 09:30 PM
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#2 |
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Tonawanda 454
Join Date: Mar 2004
Location: Liquid Sunshine State
Posts: 2,755
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from what i understand (not 100% positive) it is ok to drive for short periods but not on long drives (say over 10 miles)... if you want open pipes it is better to go straight back or somewhere towards the back with a few bends to allow SOME pressure.
Now if you have it setup with higher compression and setup similar to a street rod then you can have 12" pipes off the headers and run excellent... setup stock it SHOULD have some back pressure and the cats will allow some but not enough from how i understand...
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91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!!  04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. ------------------- |
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04-15-2005, 09:40 PM
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#3 |
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Registered User
Join Date: Oct 2003
Location: Broken Bow, OK
Posts: 1,385
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Yeah, the TBI trucks generally run like crap without some exhaust.
One of my friends cut his off right behind the cats on his 94. The thing would barely pull itself up hills. He put exhaust back on it within a week.
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95 K3500 SRW 5.7L Vortec 4L80e 4.10 G80 2001 GMC C3 6.0 AWD, Volant, 3/5 drop TBSS intake, HP tuners, pullies, 05 efans, 05 front brakes, etc. 2003 Tahoe Z71 Silverado front clip Last edited by 99-2door; 04-15-2005 at 09:42 PM. |
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