11-08-2008, 10:54 PM
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Well nothings impossable but reasonable speaking it would be extremely difficult as im sure u know about the getting over the axle issue. If you could bend your own pipes of were at the very least handy with a welder you might be able to do it but it would have to be absolutly perfect and to attain that level of perfection would be extremely difficult and time consuming out of the relm of your do it yourselfer. If you dumped it befor the axle then ide say its reasonable to do ive done that befor. Ive done 2.5 duals over the axle but even that was pretty challanging because its not just makeing a pipe that fits its makeing a pipe that fits and your able to install it without dropping the axle lol. So ide say if you want to go over the axle 2.5 is the max plus 3 in duals are probably too much for your motor anyways.
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1983 z/28 Project 350 LT1 from a 1970 camaro or corvette dual 500 cfm edelbrock carbs on a edelbrock c-26 maifold,Hooker headers, 3in dual exhaust, Comp cams 282s with solid lifter, 10:1 compression, 5 speed, and 3.73 posi rear. Rich 
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11-08-2008, 11:25 PM
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I am running 3" duals over the axle....love it so much and I have decent plans for my motor so 3" maybe overkill but it isnt hurting my performance in any way
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97 WS.6 - Meziere EWP, Pacesetter Longtubes, Duals w/ X pipe and Powersticks, Spec Stage 2, LS1 Driveshaft, Richmond 4.10s, LCA, Relocation Brackets, SFC, Chassis Mounted Adj Torque Arm  ]
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11-08-2008, 11:26 PM
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Well u see thers 2 things to concider when choseing any performance part flow rates and velocity. Without trying to get into a very in depth discussion about this concept ill try to sum it up as simply as possable. A 3 in pipe would have potential to flow a large amounts of exhaust gasses but say youve got a stock 305 the velocity would be so slow that it actually hurts performance because the exhaust pipe flows too well ( like trying to use a 1000 CFT carb on a street motor). On the flip side say you use like a 2 1/4 in dual exhaust on the 454 it would tend to choke the motor off at the high RPMs (killing for high end HP) and also have a much higher exhaust gas velocity at the low RPMs (improveing low end TQ). So to kinda sum its a balanceing act between useing a pipe thats large enough to not choke the motor off at high RPM but also have a high velocity at the low RPM. So for u if its a 305 use 2 1/4 duals with an x pipe if its a 350 depending on performance level u could use 2 1/4 or 2.5 also with an x pipe.
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1983 z/28 Project 350 LT1 from a 1970 camaro or corvette dual 500 cfm edelbrock carbs on a edelbrock c-26 maifold,Hooker headers, 3in dual exhaust, Comp cams 282s with solid lifter, 10:1 compression, 5 speed, and 3.73 posi rear. Rich
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11-09-2008, 12:07 AM
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ummmm well im guesing i should run 2.5 or maybe 3 if possible unless you guys think otherwise. i am planning on replacing my heads, cam, headers, tpi system, and adding a chip. which size would be best for my plans?
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11-09-2008, 12:15 AM
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Well for a 305 ide just a 2 1/4 pipe that be your best bet i think. If its a 350 if your mods are designed to build hp in the idle to 5 k range 2 1/4. If the mods are designed to build power in the 2500-6500 range ide use the 2.5s.
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1983 z/28 Project 350 LT1 from a 1970 camaro or corvette dual 500 cfm edelbrock carbs on a edelbrock c-26 maifold,Hooker headers, 3in dual exhaust, Comp cams 282s with solid lifter, 10:1 compression, 5 speed, and 3.73 posi rear. Rich
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11-09-2008, 03:03 AM
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 Chris1/4-12.84@108 with just muffler and ported TB 02 Artic White Z28, M6, T-top, Lowered, LCA relocation, Adj LCA's, Adj TqArm, Panhard relocation, Adj Panhard, Shock tower brace, 3-point SFC(All UMI) Hooker Coated LT, 3"TD with H-pipe, 1 chamber flowmasters, Spec stage 2, lightweight flywheel, Cross drill/slotted rotors...Also 07' WRX
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11-09-2008, 12:30 PM
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Attempting to run pipes this large on a naturally aspirated 305 or 350 is a waste of time, effort, and money no matter what upgrades you have. For optimum performance you don't need to flow anything close to that kind of volume unless you are running twin turbos or huge supercharger so that you require 6" total exhaust to equal the much increased intake. Remember our cars OEM have a 2.25" single-pipe (or on some later models 2.5") so even going to mandral-bent full-dual 2.25" is doubling your volume. Re: Fitment going over the axle on 3rd Gens (not 4th Gens) you may get away with 2.5" (guys who previously did my 3rd Gen found even dual 2" a challenge). For ground-clearance it's best to run the duals side-by-side until you're over the axle then split to 2 small hi-flo mufflers and tail-pipes.
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11-09-2008, 08:17 PM
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Quote:
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11-09-2008, 08:31 PM
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Duel 3" with LT's is very possible to do (had it on my old IROC) but I didnt run it out the rear I dumped it before the axel (I dont like the way tips looks) but ground clearance isnt the best but its not bad, I went down to a 2.5" and liked it alot better! I say go long tubes as the cost the same for a ok set of shorties ... many will agree go long or go home (shorties only help make so much power and they are a pain in the butt to put in!) Heddman makes the best fitting and tuck up high in the frame headers for the buck (hookers are nice but had way to low!) and any others will be nice but cost you more $$$$
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 '98 Z/28 LS-1, Z06 cam,SLP lid and belows, Pacesetter Longtubes,True 2.5" duels into Flowmaster One-Chambers,lowered 1.5",Built 4L80E,3.73's, and suspension work, tuned by All Out Performance
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