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78w72 · 11-17-2013, 07:42 PM

thanks but i am looking for pics & info on a 3" exhaust with an x pipe & tailpipes.

PONTIAC DUDE · 11-18-2013, 12:45 PM

I have a set of 3" tailpipes for sale in the F/S section. Aluminized. Off my 76 T/A when I was running that small of a system.

jonmachota78 · 12-02-2013, 01:19 AM

Dunno.. Still not crazy about it..

hada76 · 12-02-2013, 01:43 AM

Quote:

Originally Posted by 2002Z4CSS

Not a lot of room back there by the shocks, leaf springs and shackels and the rear sway bar

X2 BTDT even more fun w/fat tires

Don 79 TA · 12-02-2013, 07:19 AM

i went with torqe Tech's 3.5" X to 3"tails
system is very nice
before that one had their 2.5 dual kit, again super easy to install and fit absolutely perfect

before that one, had it custom made at a good high end exhaust shop

CROCIE JR · 12-04-2013, 03:07 AM

I have run multiple 2.5" systems at 425-450HP at the wheels. Engine dyno 2.5" at the 540-560hp range. Flowmasters in most cases. I like the Flowmaster crossflow system. Sound is very unique for a Flowmaster. I would do 2.5" sys. with cutouts. Never put smaller tailpipes on a system.

78w72 · 12-04-2013, 11:17 AM

Quote:

Originally Posted by CROCIE JR

I have run multiple 2.5" systems at 425-450HP at the wheels. Engine dyno 2.5" at the 540-560hp range. Flowmasters in most cases. I like the Flowmaster crossflow system. Sound is very unique for a Flowmaster. I would do 2.5" sys. with cutouts. Never put smaller tailpipes on a system.

interesting & good to know. can you comment on what you think your 450 rwhp would have done if it had 3" exhaust? thats my main concern here, will 2.5" hinder or limit the engine? even though its mostly a street car i do not want to choke this thing out, especially with possible future power increases. if i'm at ~520hp now with no tuning or possible upgrades, what happens when i hit 550-575? do i get to replace the $500 system with another $500 system? just trying to avoid that & get a system that will not hinder what i have currently & be able to support possible future increases.

as for the smaller tailpipes, what about the fact that the exhaust gases have cooled dramatically by the time they get to the tails & dont need as much diameter to flow adequetly. it's been commented on many times & even tested & proven at the track by jim hand.

my dilema is based on everything i read on this forum & others sources. if bigger exhaust is not required for higher hp, why does everyone say you need 3" at about 500hp & above. quite a few guys on this thread alone are running 3.5" off the headers into 3" mufflers & tails.

i'm curious why you say 2.5" is ok for 500+ & to "never put smaller tailpipes on a system" can you elaborate on that?

78w72 · 12-04-2013, 11:18 AM

Quote:

Originally Posted by Don 79 TA

i went with torqe Tech's 3.5" X to 3"tails
system is very nice
before that one had their 2.5 dual kit, again super easy to install and fit absolutely perfect

before that one, had it custom made at a good high end exhaust shop

got any pics of your current system?

twov8sandat4 · 12-04-2013, 12:11 PM

3" Pypes x-pipe with Race Pro mufflers and 3" tips on my 74. It does tuck up very nicely into the body.

Note: the left tailpipe was bent wrong, so we had to use an offset exit muffler on the left side to make it work. As the car was occupying a lift in my friend's shop, that was quicker fix than getting a new tailpipe. Hoping to fix it next year, along with some detail work on the undercarriage

78w72 · 12-04-2013, 12:30 PM

very nice! thanks for the pics. sure does tuck up there nicely for a 3" system.

did you buy the kit or piece it together? i dont see their hardware, just welds. what was the issue with the one tailpipe? did pypes send it to you bent wrong? as far as i know their kit & tails are made to use the off/off mufflers, not off/center like the right one in your pic. did they offer to help but you didnt have the time to wait? i'd be pretty upset if they send me a wrongly bent tailpipe!

hada76 · 12-04-2013, 01:16 PM

Quote:

Originally Posted by twov8sandat4

this is the usual trouble spot, with the leafs, sway bar, fender and fat tires its a bit tight

78w72 · 12-04-2013, 01:22 PM

i agree it can be tight back there, but from everyones pics it looks like the leaf to fender has plenty of room, & it clears the sway bar & tires... depending of course on what rims/tires one is using. mine will be 15x7 with 255/60's so it should be ok. my main concern was the 3" x pipe clearance.

twov8sandat4 · 12-04-2013, 02:58 PM

Quote:

Originally Posted by 78w72

very nice! thanks for the pics. sure does tuck up there nicely for a 3" system.

did you buy the kit or piece it together? i dont see their hardware, just welds. what was the issue with the one tailpipe? did pypes send it to you bent wrong? as far as i know their kit & tails are made to use the off/off mufflers, not off/center like the right one in your pic. did they offer to help but you didnt have the time to wait? i'd be pretty upset if they send me a wrongly bent tailpipe!

My friend spent some time to make sure it tucked up. It won't without some effort

I bought the kit from one of their resellers, BSM Exhaust, and it came with the center exit mufflers. The tailpipe was pre-bent wrong as it would not clear the leaf spring with the center outlet muffler, hence the offset exit muffler. The right side fit like a glove. The kit had the wrong x-pipe also. BSM sent me the right one without making me send the old one back, which took up a few days. And when the tailpipe issue came up, I didn't want to tie up my friend's lift any longer (he did the whole job for free...), so I over-nighted a muffler from Jeg's to expedite the matter. I am sure either BSM or Pypes would have addressed it too, but I ran out of time. Or if he had a bender he could have shaped it to fit with the center exit muffler. He also decided to weld everything rather than use the clamps.

I am using 255/60-15 tires on the 7" honeys

twov8sandat4 · 12-04-2013, 03:03 PM

Quote:

Originally Posted by CROCIE JR

I have run multiple 2.5" systems at 425-450HP at the wheels. Engine dyno 2.5" at the 540-560hp range. Flowmasters in most cases. I like the Flowmaster crossflow system. Sound is very unique for a Flowmaster. I would do 2.5" sys. with cutouts. Never put smaller tailpipes on a system.

I had that 2.5" crossflow system on my car. Did the drone when cruising bother you? My Pypes 3" is actually much quieter than the Flowmaster

ta man · 12-04-2013, 04:49 PM

How about posting track data with exhaust...my car mph's in the 118's with 3 inch PYPES X ,2.5 Ultraflows and 2.5 inch tailpipes.

Silver Judge · 12-04-2013, 07:59 PM

If you have a really healthy exhaust system budget, you could get a system that uses oval shaped exhaust tubing. Spendy but very nice & helps keep a boatload of ground clearance

mnfatcat · 12-05-2013, 02:22 AM

Built a stainless 3" system out of mandrel bends from Columbus River. Used 3" Ultra Flows w/o a crossover. Have had many compliments on the sound, will never have another car w/o a 3" system. Worth every penny and the extra effort.

CROCIE JR · 12-05-2013, 03:34 AM

I have tested a lot of complete exhaust systems on engine dynos and chassis dynos. Thats why I say what I say. All engines are different. To paint with a broad brush here and say it works for this guy or that guy is cool with me. So are you saying that hotter gasses take up more room than colder gasses? BTW, did I try to put smaller tail pipes on the dyno, no. Did I baseline with open headers and a collector extension, yes. Havnt seen a complete exhaust make more power than open headers. Have I done back pressure testing at multiple spots along a system, yes. I simply use this dyno info to jet accordingly, and say to myself " that system only sucked X of the top." I dont know why other people say what they say or do. I test in a controlled environment and use math and stuff. You guys do what you want to do. Most of the time your minds are already made up. I'll just stick to my book learnin'.