[/ATTACH]quote]I drew a cheesy diagram of how im think of running my exhaust I was looking for opinions if there would be any draw backs to this. Any help is appreciated. Also this is for a 406 smallblock and in the picture the muffler would sit back alittle further.

 

Instead of doing the first one does anyone this this second one word work better?

two spilt from one pipe to two Id use something like this
http://www.summitracing.com/parts/MPE-10798/?rtype=10

 

anythoughts? on the second one?

 

why go back to a single pipe between the headers/manifolds and the duals?

 

Slp y pipe goes from both headers into one. 3 inch exhaust.

 

Im thinking of cutting off the two 2.5" before the y pipe and going to dual 3" from there back. Im already pushing the flow limit of the 3" and plan on building another motor with 600+hp. Ive seen a few examples of this system. I know it can be done.

 

Eh. I would spend a little more time and go with true duals or a single 4'' mufflex kit I have had both and IMO both killer setups. To me there is no point in going headers to single the back to dual as far as power or flow is concerned. Theres no reason you couldn't get enough flow out of a single 3'' setup and 3'' muffler. If you need more true dual or 4'' mufflex.

In those pictures why even bother with the small Y. You could run 2.5'' pipe close together all the way back dynomax has the kit for cheap. Just takes a little fab work and a set of mufflers. Their diagram is all you need.

 

blackbmajic has a good point. I think what youre looking at is as close to true duals as possible while maintaining ease of fitment. For that i like the idea of two 2.5" paired together. Of course you would still want some sort of balance pipe. Just for information sake, Ive done comparisons on cross section of different dia pipe: Dual 2.25" has a combined cross section of 7.95", 3" is 7", dual 2.5" is 9.8", 4" is 12.55", dual 3" is 14.1".

 

Im hoping to put out around 450 with my motor, but searching through exhaust sounds im thinking of running 3 inch pipe from the y pipe and putting a 3 inch magnaflow ultraflow round some where by the drive shaft tunnel the over the axle into duals out the back. To me the ultraflow round sounds alot better than the ultra flow crossflow style muffler.

 

Good flowing exhaust setups really change little in sound. Certain mufflers give a deeper note than others. And some mufflers give a more hollow metallic note. The more HP, the more compression, the more aggressive the cam, You will hear little difference in setups. If you take the same motor with 450hp aftermarket heads around 9.75:1 comp, figure a 110lsa and .540/.565 lift 294/300dur. You will get a distinct sound from the motor not from the exhaust. You exhaust setup will only alter the sound so much. You will still have the unique sound from you motor/cam setup.

The only thing I will say is True dual exhaust has a unique sound where you can hear much more lope from your cam and less slosh. when you put your exhaust into a Y then single pipe then dual out again you hear a lot of slosh through the exhaust and less lope through the tailpipe. When you go from dual to X you hear less slosh than Y to single.

Your exhaust only flows as well as its weakest link. So If you have Y to single 3'' stay single 3'' out the back. Save the weight and money. As far as flow goes there would be no point to add a dual out muffler unless you like the way it looks. Anything after that 3'' single would be restriction or doing nothing.

 

Good info, thanks blackbmagic.

 

Remember that length as well as diameter dictate flow capacity. A short section of 3" will have much less damping effect than an entire system of 3". However, we should keep in mind that 3" can support 400+ hp. As blackbmagic says, its really the motor that makes the power/sound.

 

Chris Etemadi, a member here at TGO, runs dual 3" paired together with Hooker 2210 headers. I dont need the headers, I already have 1 3/4 primary stainless from SLP. But his exhaust is just what Im thinking about doing on mine. Very clean and would be the best flowing option.

 

In those pictures why even bother with the small Y. You could run 2.5'' pipe close together all the way back dynomax has the kit for cheap. Just takes a little fab work and a set of mufflers. Their diagram is all you need.
Blackbmagic Could use give me the link to this? All I saw was 2.25. Thanks