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#1
04-08-2008, 11:16 PM
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3'' too big?
I think i've narrowed it down t the pypes exaaust with the street pro's or whatever they're called. But for a 350 with an 068 mildly ported #11 heads a performer and a 650 holley, would the 3'' be too big as in not enough backpressure or would it be fine? Thanks-Pat
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#2
04-09-2008, 01:04 AM
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back pressure is bs..run the 3 inch
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#3
04-09-2008, 09:39 AM
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plan for the future of upgrades with an exhaust sysem with a lifetime warranty.
Get the 3 inch and street pros, its what I have.
__________________
Keepin it real in 2025. 'just another time traveler...       :range r: 
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#4
04-09-2008, 10:32 AM
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2.5" vs 3" exhaust system
Also be prepared for more cabin resonance w/ 3" exhaus; regardless of muffler choice. Personally, I like the BIG sound, but it can be annoying on a all day drive. The dividing line, performance wise, is around 475 fhp. If you plan to make less, stick w/ 2.5" pipes.
Les
__________________
Les Iden ---------------------------- '65 Buick Sport Wagon Custom, 340, T350, 3:23 '66 GTO Post/468, 700R4, 3.31 (Mike's as of 9-16) '68 Grand Prix/455, dual AFBs, T400, 2:93 posi (sold) '72 TA tribute/461, T400, 3.08, (Russ's as of 9-16) '97 Mitsubishi Eclipse Spyder Turbo, Konis, 5 speed '09 Torrent GXP, nav, Sun & Sound pkg., Bilsteins |
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#5
04-09-2008, 10:37 AM
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I've got 3" on my 68 GTO that has 400 to 425 hp..... I'm going back to 2.5". With 3"... their louder and take up some room... at my horse power - doesn't do anything. I say a good 2.5" system with an X or H cross over.
.
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#6
04-09-2008, 12:10 PM
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I have been pondering this for a while i have a 2.5 system with x pipe for my first gen firebird amnd I'mnot sure it's big enogh at around 435 hp??
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#7
04-09-2008, 01:13 PM
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Some charts - for sizing (keep in mine "optimum" set ups)
http://www.angelfire.com/fl4/pontiac...xh.sizing.html http://www.torquetechexh.com/whichsize.htm
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#8
04-09-2008, 01:36 PM
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the larger the diameter tubing, the better for exhaust...I run a 3.5-inch exhaust with my 350 ci.
__________________
1963 Tempest Convertible Pontiac-Powered Funny Car: 400 block, Littlefield 8-71 blower, Enderle injection, custom blower intake, three-disc glide clutch, three-speed Lenco 
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#9
04-09-2008, 06:40 PM
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So i guess ill just get a free flowing 2.5 w/ an X pipe. Are you serious about the 3.5 or is that a joke?
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#10
04-09-2008, 07:38 PM
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See his avatar and signature: it's a digger............
Les
__________________
Les Iden ---------------------------- '65 Buick Sport Wagon Custom, 340, T350, 3:23 '66 GTO Post/468, 700R4, 3.31 (Mike's as of 9-16) '68 Grand Prix/455, dual AFBs, T400, 2:93 posi (sold) '72 TA tribute/461, T400, 3.08, (Russ's as of 9-16) '97 Mitsubishi Eclipse Spyder Turbo, Konis, 5 speed '09 Torrent GXP, nav, Sun & Sound pkg., Bilsteins |
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#11
04-09-2008, 08:44 PM
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Quote:
 
__________________
1963 Tempest Convertible Pontiac-Powered Funny Car: 400 block, Littlefield 8-71 blower, Enderle injection, custom blower intake, three-disc glide clutch, three-speed Lenco
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#12
04-09-2008, 10:20 PM
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Thats BADASS!
 i think it might be overkill on my little lemans though...
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#13
04-09-2008, 10:45 PM
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Quote:
__________________
1963 Tempest Convertible Pontiac-Powered Funny Car: 400 block, Littlefield 8-71 blower, Enderle injection, custom blower intake, three-disc glide clutch, three-speed Lenco
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#14
04-11-2008, 09:54 AM
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Quote:
__________________
Resto almost done - 1966 GTO HDTP Tiger Gold (paint code 1-2), black vinyl top and interior, 389 tripower, 068 cam, TH-350/Hughes TC, RA manifolds, 2.5" Pypes exhaust, Scarebird Front Disc, Ralley II's, factory PS, PB, PW, PA, A/C, headrest option. |
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