opinions on this exhaust set up
Thread Starter
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Joined: Oct 2003
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From: Northern Va
opinions on this exhaust set up Im putting in Pacesetters tomorrow, and i basiclaly have a pile of piping, a mandral bender, a lift, someone to weld and about 15 hours to work with.
I got the ok from a few local policemen (friends of the family), to go ahead with lt's as long as i keep keep the car at "tolerable decibels", however i want it to be louder than most around here.
I wanted to put just one 4 inch bullet muffler in teh I pipe but i did not get the ok for that one. So this is my thoughts...
I have a 2.5 inch mandrel bent bassani y pipe with magnaflow cats in it, the cats are situated in such a way that i could reuse it with the long tubes, and i will have access to 3" to 2.5 inch reducers. So getting the y pipe to fit to the lt's should be no problem...now this is what im not sure about...
from the exit of the Y pipe...I was thinking just sticking with 2.5 inch piping, over the axle to a another Y section from my loudmouth, then placing one 4 inch bullet style muffler behind each exhaust tip. Do you think this would keep the sound level down enough?
I actually built a very similar set up on a 3000gt with shorties, 2.5 inch down pipe, 2.5 inch piping to a random technologies highflow cat to a y pipe and split it to dual outlets using the same 4 inch bullet style mufflers, it sounds wicked. and my guess is it could only get better with a v8.
comments and opinions are welcome. what do you guys think?
Travis
I got the ok from a few local policemen (friends of the family), to go ahead with lt's as long as i keep keep the car at "tolerable decibels", however i want it to be louder than most around here.
I wanted to put just one 4 inch bullet muffler in teh I pipe but i did not get the ok for that one. So this is my thoughts...
I have a 2.5 inch mandrel bent bassani y pipe with magnaflow cats in it, the cats are situated in such a way that i could reuse it with the long tubes, and i will have access to 3" to 2.5 inch reducers. So getting the y pipe to fit to the lt's should be no problem...now this is what im not sure about...
from the exit of the Y pipe...I was thinking just sticking with 2.5 inch piping, over the axle to a another Y section from my loudmouth, then placing one 4 inch bullet style muffler behind each exhaust tip. Do you think this would keep the sound level down enough?
I actually built a very similar set up on a 3000gt with shorties, 2.5 inch down pipe, 2.5 inch piping to a random technologies highflow cat to a y pipe and split it to dual outlets using the same 4 inch bullet style mufflers, it sounds wicked. and my guess is it could only get better with a v8.
comments and opinions are welcome. what do you guys think?
Travis
I would go with 3" piping all the way out the back. I think that 2.5 is a little small for a single catback with our engines (it's like blowing through a coffee straw), especially if i you plan to get serious with the engine later on down the road (heads, cam, etc.) Another muffler after the alxe will quiet things down a little bit. I think you will be ok with the set up you described, except with 2.5 piping.
Robbie
Robbie
I agree, and I'll add that it will sound better and flow well with 2.5" True Duals. 
With cats and bullets alone it will be very loud at large throttle openings, much louder than even small straight through mufflers.
With cats and bullets alone it will be very loud at large throttle openings, much louder than even small straight through mufflers.
Thread Starter
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Joined: Oct 2003
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From: Northern Va
can't do true duals. i wish i could cause i've heard a few cars locally with the TD and it sounds amazing. i think i might just go with the two bullet mufflers or maybe teh moroso spiral flow mufflers just before the tips and use 3 inch pipe. Do you suppose if i put the two mufflers before the tips and then another bullet in the I pipe it would quiet it down some? or am im just looking at no matter what i do with lt's and bullets and/or spiral flow mufflers im gonna be loud as hell?
thanx for the replies fellas
T
thanx for the replies fellas
T
Thread Starter
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Joined: Oct 2003
Posts: 1,655
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From: Northern Va
how much power would i actually lose from going with a 2.5 inch y pipe with cats and 2.5 inch I pipe to 2.5 inch tail pipes over a full 3 inch y pipe to tips set up? i mean if its going to cause me to lose 15 rwhp, it woudln't be worth it but if its 5-10 rwhp or something like that, considering the money id be saving cause i wouldn't have to order any othe rparts, that would be worth it to me. just lemme know im trying to come up with a full exhaust setup so i can custom fit everything on sunday and install it all together at once.
thnx
T
thnx
T
Well, for your setup and application, you will probably see ZERO difference between 2.5" and 3" tubing after the first Y pipe. The flow restriction might cost you 10+ rwhp AFTER you do heads and cams, when you're really moving some air I've heard.
Since you are putting this together tomorrow, here are some points I would consider:
- Unless you plan on rebuilding the system in the future, or never want to get heads and cams, it would be worthwhile to me to do the exhaust once and be done with it.
- 3" tubing would be a minimal replacement to your current parts
- you don't need bullets in the first Y if you are running high-flow (or any cats)
- If you have a real 1 into 2 muffler after the axle, it probably won't be "objectionaby" loud, you should be fine. However, if you want to get creative, you can try to fit some small mufflers, one each right before the tip, like Pitbull mufflers. I've heard you have to bang the floorboards a bit on firebirds, but ls1speed's website has a pic of that which seems to fit fine.
- Lastly, if you can't fine 3" tubing withing time, you should be fine for several years with your mods and application without missing anything.
Just my opinion.
Since you are putting this together tomorrow, here are some points I would consider:
- Unless you plan on rebuilding the system in the future, or never want to get heads and cams, it would be worthwhile to me to do the exhaust once and be done with it.
- 3" tubing would be a minimal replacement to your current parts
- you don't need bullets in the first Y if you are running high-flow (or any cats)
- If you have a real 1 into 2 muffler after the axle, it probably won't be "objectionaby" loud, you should be fine. However, if you want to get creative, you can try to fit some small mufflers, one each right before the tip, like Pitbull mufflers. I've heard you have to bang the floorboards a bit on firebirds, but ls1speed's website has a pic of that which seems to fit fine.
- Lastly, if you can't fine 3" tubing withing time, you should be fine for several years with your mods and application without missing anything.
Just my opinion.
Thread Starter
TECH Fanatic
Joined: Oct 2003
Posts: 1,655
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From: Northern Va
i do have a hooker catback sitting at my house but im thinking about using the bullet style mufflers jsut before the tips. the sound i've heard from sound files i've found is awesome. with cats i dont think it would be too loud, but i have about 15 to choose from so if i needed to add one into the I pipe just for sound control that would be a 15 minute job.
no heads, no cam going in ever. wish i could afford that but 17,500 for school is going to scratch any of those plans.
last question...considering this set up with the 2.5 inch piping wont cost me a dime more than each of teh mufflers at whole sale price, i've got pacesetters and thats a 3 inch collector correct? do i just need as lip fit reducer to fit the 2.5 inch piping to it? or could i band clamp and weld it? that will be the stickler of the job tomorrow.
thanx for the advice and info
T
no heads, no cam going in ever. wish i could afford that but 17,500 for school is going to scratch any of those plans.
last question...considering this set up with the 2.5 inch piping wont cost me a dime more than each of teh mufflers at whole sale price, i've got pacesetters and thats a 3 inch collector correct? do i just need as lip fit reducer to fit the 2.5 inch piping to it? or could i band clamp and weld it? that will be the stickler of the job tomorrow.
thanx for the advice and info
T
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