Bullets off the collector or keep Y pipe
04-28-2010, 04:17 PM
#62
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Thanks for the info from you and TA1364. I will take your advice and probably stick with my set-up for now. I was looking more for the weight loss and maybe a slight performance than the sound. Thanks again.
04-28-2010, 09:45 PM
#64
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04-28-2010, 11:15 PM
#66
I'd ditch a heavy catbback. Losing that weight won't pick up an ET in itself, but combine it with a few other weight reductions and you should get some results.
I definitely reccomend the Ypipe/bullet as mentioned due to sound and performance. The y-pipe is probably the same weight as an additional bullet.
If you do go the dual bullet route, bust out the BFH and make room on each side. I also "squished" the bullets a tad in a press so they were slightly oval. I probably have pics somewhere. If I do I'll post them up.
04-28-2010, 11:23 PM
#68
Y-pipe set up:
Bullets (sorry, could not find installed pics, but it had better clearance than the TSP y-pipe as far as I can remember)
See the flattened surface. It was still totally round through the pipe. It just compressed the glass pack portion:
Bullets (sorry, could not find installed pics, but it had better clearance than the TSP y-pipe as far as I can remember)
See the flattened surface. It was still totally round through the pipe. It just compressed the glass pack portion:
04-29-2010, 07:13 AM
#69
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Your precat 02s will be fine. I assume you have removed your rear 02s. As long as you have ~12" of pipe (or muffler) after then you are fine.
I'd ditch a heavy catbback. Losing that weight won't pick up an ET in itself, but combine it with a few other weight reductions and you should get some results.
I definitely reccomend the Ypipe/bullet as mentioned due to sound and performance. The y-pipe is probably the same weight as an additional bullet.
If you do go the dual bullet route, bust out the BFH and make room on each side. I also "squished" the bullets a tad in a press so they were slightly oval. I probably have pics somewhere. If I do I'll post them up.
I'd ditch a heavy catbback. Losing that weight won't pick up an ET in itself, but combine it with a few other weight reductions and you should get some results.
I definitely reccomend the Ypipe/bullet as mentioned due to sound and performance. The y-pipe is probably the same weight as an additional bullet.
If you do go the dual bullet route, bust out the BFH and make room on each side. I also "squished" the bullets a tad in a press so they were slightly oval. I probably have pics somewhere. If I do I'll post them up.
04-29-2010, 09:41 AM
#70
09-15-2020, 01:58 PM
#72
11 Second Club
I'm sure you are already well aware that bullets hooked to the headers are as loud as open collecters.
I will also say that every engine is NOT created equal. There will always be a limitation reached with an exhaust. In lower HP cases MORE backpressure is needed.
We are restricted to 90 dbs. @ 5000rpm's from 100 feet away at Englishtown which has forced us into finding a better exhaust at our expense and countless hours. (Buy the way, 90 dbs. still isn't quiet!)
All combinations have been checked with a DB. meter following the tracks testing procedures. Many systems we run have been built by Mufflex. Most systems we use have bolt on flanges on mufflers and at the headers for easy removal during testing and future changes if needed. A custom 3"-4" flowmaster merge y-pipe with an oval dynatek or magnaflow muffler has made the same HP on a dyno as two single chamber mufflers bolted to the headers. It is also 8-10 dbs. quieter. It has ET'd and MPH the same also for us. This has been tested up to 408 cubic inches on both N/A and Nitrous applications. (Sorry. We don't spray our engines on the dyno) The Dynatek is aluminized which makes for less weight then the stainless magnaflow which has proven to be 1-2 dbs. quieter then the Dynatek. Running a true dual system with an X-Pipe and two Dynatek mufflers has proven to be even quieter and maintain performance like the Y-pipe. It is a heavier system due to the dual mufflers though. Aiming the turndown at the ground with a single muffler and aiming the turndowns on the duals at each other and slightly towards the ground aids in cancelling sound. Both of these systems are also quieter then the popular two chamber mufflers bolted to the headers with turndowns. Which buy the way doesn't reach the 90 dbs. we're looking for. Staying away from stainless and using aluminized pipes and mufflers saves weight.
This year we are testing the limitations of the y-pipe on the 454 nitrous car of N2Ostroker. He ran quite a few 9.0 passes last year. It's VERY clear to us that this is a restriction but we don't know how much. We will run the y-pipe with the muffler removed from the y-pipe and run the car with everything removed all in the same day. This should be a very good test of the limitations of this system.
We also broke the bank with a true dual 3.5" oval system with twin Dynatek mufflers on a 440 Nitrous application with a best of 8.65 and a total of only 8 nitrous passes. Testing with and without the exhaust will hopefully be in this years schedule although this engine and exhaust is now in a different car.
Hopefully our time and money will help some who read this post
I will also say that every engine is NOT created equal. There will always be a limitation reached with an exhaust. In lower HP cases MORE backpressure is needed.
We are restricted to 90 dbs. @ 5000rpm's from 100 feet away at Englishtown which has forced us into finding a better exhaust at our expense and countless hours. (Buy the way, 90 dbs. still isn't quiet!)
All combinations have been checked with a DB. meter following the tracks testing procedures. Many systems we run have been built by Mufflex. Most systems we use have bolt on flanges on mufflers and at the headers for easy removal during testing and future changes if needed. A custom 3"-4" flowmaster merge y-pipe with an oval dynatek or magnaflow muffler has made the same HP on a dyno as two single chamber mufflers bolted to the headers. It is also 8-10 dbs. quieter. It has ET'd and MPH the same also for us. This has been tested up to 408 cubic inches on both N/A and Nitrous applications. (Sorry. We don't spray our engines on the dyno) The Dynatek is aluminized which makes for less weight then the stainless magnaflow which has proven to be 1-2 dbs. quieter then the Dynatek. Running a true dual system with an X-Pipe and two Dynatek mufflers has proven to be even quieter and maintain performance like the Y-pipe. It is a heavier system due to the dual mufflers though. Aiming the turndown at the ground with a single muffler and aiming the turndowns on the duals at each other and slightly towards the ground aids in cancelling sound. Both of these systems are also quieter then the popular two chamber mufflers bolted to the headers with turndowns. Which buy the way doesn't reach the 90 dbs. we're looking for. Staying away from stainless and using aluminized pipes and mufflers saves weight.
This year we are testing the limitations of the y-pipe on the 454 nitrous car of N2Ostroker. He ran quite a few 9.0 passes last year. It's VERY clear to us that this is a restriction but we don't know how much. We will run the y-pipe with the muffler removed from the y-pipe and run the car with everything removed all in the same day. This should be a very good test of the limitations of this system.
We also broke the bank with a true dual 3.5" oval system with twin Dynatek mufflers on a 440 Nitrous application with a best of 8.65 and a total of only 8 nitrous passes. Testing with and without the exhaust will hopefully be in this years schedule although this engine and exhaust is now in a different car.
Hopefully our time and money will help some who read this post
09-21-2020, 07:02 AM
#73
X or h pipe vs just a muffler/bullet off the collector will get you nothing. Even if it does gain any power, the weight will be enough to even it out, or make you be worse off.
Magnaflow makes a small oval muffler alot of people have put off the end of the collectors, I'd look into that.
I ran a length of pipe so I could ptu a super 44 flowmaster on both sides, and a little bit of pipe off the end. Granted that's 3.5 inch in and out, but it doesn't cost me any power over open headers, track #'s confirm this, being I've run as fast with it on and off... not the lightest due to the pipe dia and whatnot, but it works good. The motor plate, allowed me to solid mount the exhaust to the attachment points of my ds loop, and this allowed the exhaust to be tucked up really good.
Just get something that's only a 4 inch dia case, and you can tuck it up pretty good.
Magnaflow makes a small oval muffler alot of people have put off the end of the collectors, I'd look into that.
I ran a length of pipe so I could ptu a super 44 flowmaster on both sides, and a little bit of pipe off the end. Granted that's 3.5 inch in and out, but it doesn't cost me any power over open headers, track #'s confirm this, being I've run as fast with it on and off... not the lightest due to the pipe dia and whatnot, but it works good. The motor plate, allowed me to solid mount the exhaust to the attachment points of my ds loop, and this allowed the exhaust to be tucked up really good.
Just get something that's only a 4 inch dia case, and you can tuck it up pretty good.
