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3" too much??

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Old Oct 4, 2004 | 01:28 AM
  #1  
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Default 3" too much??

i plan on getting true duals in the not too distant future and i was wondering with my setup if 3" would be too much...i plan on dumping before the axel and using dynomax mufflers...do you guys think ill have enough back pressure for the motor..i dont want to over do it, but i also plan to continue modding the car
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Old Oct 4, 2004 | 01:44 AM
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3" will be fine, but if you're having any problems with ground clearance. Then 2.5" would be better.

Either way.. it's gonna be LOUD
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Old Oct 4, 2004 | 01:55 AM
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Originally Posted by Z28Venom
Either way.. it's gonna be LOUD
Yes it is, but you will love it. I have 3" and as long as I hit bumps and rises at angles, I do fine as far as clearance.
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Old Oct 4, 2004 | 10:08 AM
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my car is loud as it stands....but its raspy loud...my cousin just got his duals put on his 408ci and its sounds bad as ****...and its really not that loud until he goes into warp speed
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Old Oct 4, 2004 | 12:03 PM
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helpppppppppppppp please?!?!?!? i9 have a 98 trans am with some bolt ons. it has slp air lip, smoothe bellow, 85mm maf, slp y-pipe and a corsa 3 inch exhaust system. it is very quick on high way but at the 1/4 mile i can't better than 13.5 at 100.40. best 60' is 2.00. i think i have 3:42 gears i am upgrading to 3:73 with a 2200 vigilanti stall kooks headers, new y-pipe, magnaflow cats. also f.a.s.t intake. where should i be in times please help any1 ty
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Old Oct 4, 2004 | 12:17 PM
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First, capitalization and punctuation go a long way.

Second, this is in the wrong forum, and its bordering on hijacking someone else's topic.

Third, if you're only trapping 100 it isn't very quick on the highway.

Forth, stop buying SLP parts.

Fifth, you probably have 3.23 or 2.73 gears if its stock.

Sixth, get a bigger stall, a 2200 will get you laughed at.

Seventh, people have been to the 11's with just bolt ons, but don't count on it.
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Old Oct 4, 2004 | 12:19 PM
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I just build a custom 3"(dual) system for my vette and its actually quieter than with the 2.5". I'm on a 346 + agressive H & C.
Phillip
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Old Oct 5, 2004 | 01:26 AM
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Originally Posted by z98
First, capitalization and punctuation go a long way.

Second, this is in the wrong forum, and its bordering on hijacking someone else's topic.

Third, if you're only trapping 100 it isn't very quick on the highway.

Forth, stop buying SLP parts.

Fifth, you probably have 3.23 or 2.73 gears if its stock.

Sixth, get a bigger stall, a 2200 will get you laughed at.

Seventh, people have been to the 11's with just bolt ons, but don't count on it.
trapping a 100 is stock 03-04 gt speed, thats not fast.
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Old Oct 5, 2004 | 08:37 AM
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From: fortress of solitude
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thanks for the feedback so far...

NOSEUPCHROMEDOWN - you think with 3" the flowmaster wont limit my flow?? i like the way my cousin's car sounds with his bullets, but i may try to do something different, still not sure

WRATH22 - what'd the five fingers say to the face.......SLAP!
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Old Oct 6, 2004 | 10:08 AM
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From: fortress of solitude
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how much do these flows cost and where's the best place to get them...also you have a 2.5 inch all the way through or just the mufflers??
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Old Oct 6, 2004 | 02:35 PM
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think of it this way, your collectors are gunna be 3", so why not keep maximum flow all the way back.
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Old Oct 6, 2004 | 02:56 PM
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Why not? Clearance on lowered cars.
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Old Oct 6, 2004 | 03:41 PM
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Originally Posted by Beast
i plan on getting true duals in the not too distant future and i was wondering with my setup if 3" would be too much...i plan on dumping before the axel and using dynomax mufflers...do you guys think ill have enough back pressure for the motor..i dont want to over do it, but i also plan to continue modding the car
Dual 3 inch might lose some power on a stock motor below 3K but above that should only make more hp and tq.
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Old Oct 6, 2004 | 04:38 PM
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Originally Posted by NoseUpChromeDown
It's just too much. A 346 @ even 7000rpm wouldn't use it. If I could actually use something of that size, many more manufacturers would make 4" cat-back systems. Just not needed.
I didn't mean that it was needed, just that it probably wouldn't LOSE rwhp. Based on open header / cutout dynosheets.
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Old Oct 6, 2004 | 07:03 PM
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3" is fine. 2.5" if you are lowered or plan to be. I have great clearance on stock height. No tip toeing over bumps, no scraps, and I pull up my inclined driveway without a problem. I know I definately gained over my ORY setup. Shaved a 10th off my time with all things being equal (my shitty lauch) and I kept trimming some off once I got better. Check my sig for numbers, pics and clips. I just think things should be consistant (same diameter as collectors) and symmetrical (thus duals). Good Luck
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Old Oct 7, 2004 | 01:12 AM
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From: fortress of solitude
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so 2.5 would yield me better low end...i would like to keep the low end that i have...the cam already zapped some of it so if 3" is gonna take from it compared to a 2.5 then i may end up going 2.5 instead
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Old Oct 16, 2004 | 12:20 PM
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From: fortress of solitude
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well i got my 3" duals yesterday.....some of the best money ive spent. my car sounds like death. the best part about it is that the car is actually a bit quieter and not so obnoxious. the drone is about the same(which isnt bad) and its quiet in the cabin, even with the windows down. I have dumps btw

True duals = wholesome goodness
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