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| c4-zo7-91 | exhaust diameter question | ||
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Senior Guru
 
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hi guys,
currently i have 1/3/4" long diameter headers with high flow cats ,x-pipe and true dual 2.5 " Mandrel bend exhaust back out thru magnaflow straight thru mufflers. there is no kinks or nausty bends thru out the system,just nice flowing pipes. ok so here is the question that i would like to hear lots of thoughts and ideas on,will this exhaust set up be ok and large enough to support a 388.ci high compression 11:5:1 ,8 t/b intake 236/242 roller cam,afr 195 ported comp heads,450-500 rwhp ??? i thought 2.75 " diameter would be nice but then i would have to spend more money and do the whole lot again,and if you go to large on diameter pipes dont you loose to much important back preasure??? cheers glen |
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Posted on: 2008/9/20 22:34
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| Notorious | Re: exhaust diameter question | ||
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Elite Guru
 
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You'll be fine, don't f*** with it. I switched from 1 5/8" headers and 2 1/2" mandrel exhaust to 1 3/4" headers and a 2 3/4" mandrel exhaust on my 388. I lost low end torque and response and gained nothing appreciable on the top end. I'll be putting the smaller exhaust back on eventually.
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Posted on: 2008/9/20 23:37
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| c4-zo7-91 | Re: exhaust diameter question | ||
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Senior Guru
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hi notorious,
how are ya. thanks for your reply and advice. thats good too know that my exhaust should be fine, thanks for that. finally i got some thing rite done. i heard that too big a exhaust and you can loose power and back preasure,so bigger is not always better. cheers glen |
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Posted on: 2008/9/21 5:27
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| cuisinartvette | Re: exhaust diameter question | ||
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Elite Guru
 
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Agree with Notorious. Mandrel bent 2.5 can handle a good bit of power.
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Posted on: 2008/9/21 7:00
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| c4-zo7-91 | Re: exhaust diameter question | ||
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Senior Guru
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Hi ron,
cool man,im glad my mandrel 2.5 " true dual exhausts will be fine then. the larger exhaust 2.75 "/3" looks nice/tuff though. i will just leave as is. cheers glen |
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Posted on: 2008/9/21 7:09
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| MK 82 | Re: exhaust diameter question | ||
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Senior Guru
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How long has this build been going on?
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Posted on: 2008/9/21 14:57
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| c4-zo7-91 | Re: exhaust diameter question | ||
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Senior Guru
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Quote:
just curoius why you wanted to know??? since iv had the car,2 years now. i have to do things slow as im on limited funds and dont have a open check book. if i had my way i would have it all done in a instant. but im slowly getting there pay by pay. |
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Posted on: 2008/9/21 19:24
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| Danspeed1 | Re: exhaust diameter question | ||
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Elite Guru
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As others have already posted, 2.5 is more than enough. Years ago I asked this question about my 396 Big Block Chevelle. I was running 2.5 duals into flowmasters. More than enough flow for a BBC, 2.5 inch on a SB, even a worked one, will be more than adequate.
DG |
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Posted on: 2008/9/22 22:39
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| Lichen | Re: exhaust diameter question | ||
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Quote:
Hey Glen! It's actually not a bad question. You and I had words and straighted it out peacefully. Better to take your time and do things right than to hurry up and put a bunch of crap on it. I've been modding my '93 for 6 years now and am "almost" done. I hate it when people ask "what are the cheapest shocks, or the cheapest whatever that I can put on my Corvette". Well, if you want the cheapest part that you can find for your car, maybe you should think about buying a Yugo. |
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Posted on: 2008/9/23 1:30
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| c4-zo7-91 | Re: exhaust diameter question | ||
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Senior Guru
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Quote:
hi mate,yeah no worries,all cool. cheers glen |
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Posted on: 2008/9/23 7:08
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