Northwest Members - Custom True-Dual Exhaust

I'm bored today so here's a few pics of the exhaust I'm building for the black car. I used the existing ball flange mounts from my old Y-Pipe and hacked them off to start over with a fresh new exhaust. It's got two 12" long bullet mufflers straight off the headers, then I fabbed up my own X-Pipe from a 3" U-bend that I cut/welded together. I put the X-pipe through the tunnel mount for the torque arm. Who says you can't have true dual exhaust, with an X-pipe, and still have a tunnel mount type torque arm? :) I'm nearly finiished with this setup. Both pipes exit on the passenger side just before the rear axle. Eventually I'd like to take the pipes over the axle and exit behind the axle with two more mufflers. It's loud as hell at the moment but this will get me through the season. :)

http://i34.photobucket.com/albums/d136/Bowties4evr/Z28/Custom%20Exhaust%2009-05-09/001.jpg

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Mike

Dam that looks nice man!! Cant wait to hear it :usa:

Yes that is sick bro. Looks good. So are you putting two more mufflers after the bullets or what. And how big is the diameter of the bullets?

Yes that is sick bro. Looks good. So are you putting two more mufflers after the bullets or what. And how big is the diameter of the bullets?

Thanks guys. The bullets are 3" in/out with a 4" OD and they're both 12" long. I'd like to add some more mufflers after the axles at some point, but for now they'll remain dumped just before the rear axle. And yes,,,, it's loud. LOL... :D

Mike

Thanks guys. The bullets are 3" in/out with a 4" OD and they're both 12" long. I'd like to add some more mufflers after the axles at some point, but for now they'll remain dumped just before the rear axle. And yes,,,, it's loud. LOL... :D

Mike

damn that looks good, i wish my dueals were like that. i have clearance issues on mine. what kind of clearence do u get with that setup?

damn that looks good, i wish my dueals were like that. i have clearance issues on mine. what kind of clearence do u get with that setup?

Thanks man. I just went on the first drive in the car since doing all this work to it. I have more ground clearance with this setup than my previous y-pipe that had the catalytic converters,,,, way more clearance actually. The tunnel mount crossmember hits before the exhaust does. The old y-pipe used to drag on EVERYTHING in the road.

Holy shit this thing is loud as fuck now. What's the decibel limit at PIR,,, 103 db? Hmmmmm. I think it's louder than Cody's dragster (101 db) so it might be close to the limit out there. We'll see this Friday I guess... :D

Mike

I think I was at 108 with the cutouts open haha. I also think the cutoff is like 98, maybe the tech guy will chime in forgot his name. The duals look good though mike I will try making it friday to hear you run and see you bring that front end up.

You were right it's 103 DB until 10 o'clock then it drops to like 90 DB or something

I think I was at 108 with the cutouts open haha. I also think the cutoff is like 98, maybe the tech guy will chime in forgot his name. The duals look good though mike I will try making it friday to hear you run and see you bring that front end up.

Thanks Brandon, and glad to hear that you'll be there. Are you going to make some passes in the TA? I'm gonna try to make it out there every Friday night (weather permitting) until they close the track. I need some seat time in the car to get the chassis dialed-in lol....

Mike

I will not run until I get the 9". I figgure if I blow up my eaton, there goes $500 or so.

I will not run until I get the 9". I figgure if I blow up my eaton, there goes $500 or so.

I have a spare 10 bolt sitting here. If your broke yours I'd let ya use it until you got up and running again.

Mike

Thanks guys. The bullets are 3" in/out with a 4" OD and they're both 12" long. I'd like to add some more mufflers after the axles at some point, but for now they'll remain dumped just before the rear axle. And yes,,,, it's loud. LOL... :D



Mike
yeah I bet it's loud.:).. You got more clearence now even with 3inch piping? So what would it for me to have u weld up another X-pipe kit for me, cause I have 3inch also and I scrap, not all the time, but most of the time. And I could probably take that other DS off your hands at the same time. Oh also got another job, pumping gas to fund my mods on my car. First thing is a cam.:):) then LS6 intake and lid.

yeah I bet it's loud.:).. You got more clearence now even with 3inch piping? So what would it for me to have u weld up another X-pipe kit for me, cause I have 3inch also and I scrap, not all the time, but most of the time. And I could probably take that other DS off your hands at the same time. Oh also got another job, pumping gas to fund my mods on my car. First thing is a cam.:):) then LS6 intake and lid.

My old y-pipe had cats and those things drug on the ground all the time and even the crown on the road would scrape them. My car is lowered about 1.50" - 1.75" so it's fairly low. I've only driven the car once since I got the exhaust finished up, but I don't scrape on things now that I used to scrape on before. Plus I took the time to place the exhaust hanger in the most solid place possible. That allowed me to place the exhaust piping super tight against the bottom of the car without moving or bumping around.

I could take a look at your system and see what I could come up with. It's probably something that just needs a few tweaks. It's amazing what a small tweak can make in ground clearance.

Mike

My old y-pipe had cats and those things drug on the ground all the time and even the crown on the road would scrape them. My car is lowered about 1.50" - 1.75" so it's fairly low. I've only driven the car once since I got the exhaust finished up, but I don't scrape on things now that I used to scrape on before. Plus I took the time to place the exhaust hanger in the most solid place possible. That allowed me to place the exhaust piping super tight against the bottom of the car without moving or bumping around.

I could take a look at your system and see what I could come up with. It's probably something that just needs a few tweaks. It's amazing what a small tweak can make in ground clearance.

Mike
Wow!! Lol I wouldn't be able to lower mine even like .250 of an inch. My X-pipe is the part that scrapes the most, lol it's all scared up. If you would be able to do anything I would need to replace the driver side piece were the fuel lines are at, cause we just took a hammer and a torch and jus beat it in, instead of doing a nice job and pressing it down.

Wow!! Lol I wouldn't be able to lower mine even like .250 of an inch. My X-pipe is the part that scrapes the most, lol it's all scared up. If you would be able to do anything I would need to replace the driver side piece were the fuel lines are at, cause we just took a hammer and a torch and jus beat it in, instead of doing a nice job and pressing it down.

Do you have an aftermarket torque arm?

Here's a few shots of the rest of the exhaust after I finished it up. I angled the tailpipes over toward the passenger side and then dumped them down at an angle. Hopefully PIR's decible meter is toward the tower side lol.... Otherwise I might be screwed with the noise level.

http://i34.photobucket.com/albums/d136/Bowties4evr/Z28/Custom%20Exhaust%2009-05-09/007.jpg

http://i34.photobucket.com/albums/d136/Bowties4evr/Z28/Custom%20Exhaust%2009-05-09/008.jpg

http://i34.photobucket.com/albums/d136/Bowties4evr/Z28/Custom%20Exhaust%2009-05-09/009.jpg

Mike

Wow!!! That looks really good:D. And yes the BD is towards the tower side, atleast that's what the guy from Gresham tranny said. I wish I had the a after market tourqe arm.:(

[QUOTE=Mikey 97Z M6;12199299]Do you have an aftermarket torque arm?

Here's a few shots of the rest of the exhaust after I finished it up. I angled the tailpipes over toward the passenger side and then dumped them down at an angle. Hopefully PIR's decible meter is toward the tower side lol.... Otherwise I might be screwed with the noise level.

thta is a nice exhaust, one of the better ones ive seen.

very nice duals!!!!makes me wanna a set

Looks bad ass Mike! Really liking the set up bro!

Looks bad ass Mike! Really liking the set up bro!

Hey where were ya on Friday?

Thanks everyone. I think it free'd up a little horsepower. I added about 85-90lbs to the car with the rollbar and sfc's, but it ran about the exact same trap speeds. :D

Mike

Seem you guys already figured a few things out but the decibel limit is as follows:

Before 10pm: 103dB as a single, 105dB pair
After 10pm: 90dB as a single, 91 dB pair

-We start doing noise passes (single you out if the pair was over 91 dB) @ 9pm.

-The noise meter is on the tower side between the 330' and the 594' in the bleachers.

I used to be the Sound Monitor ;). Wasn't the most popular guy as you can imagine.