I am going to be adding a 6# - 9# (and even more once i get the 390SB built) blower soon and was wondering what the optimal exhaust setup would be. 3" true duals? 3.5" 4"?
see my mods below
see my mods below
optimal exhaust setup
sicminds
1 - 9 of 9 Posts
Joined
·
6,587 Posts
go with a single 3"/ 3" duals is way too much exhaust for what most of us are doing on this site. (unless your building a big block on roids, id stay away from 3" duals. hell, imo, 2.5' duals are too big.
get a 2.25" y-pipe made up, then flow into a flowmaster or something similar y-pipe collector dump into a 3" single pipe. have all the pipe in aluminized tubing and imo again, get an aeoturbine 3030. youll freakin love it.
get a 2.25" y-pipe made up, then flow into a flowmaster or something similar y-pipe collector dump into a 3" single pipe. have all the pipe in aluminized tubing and imo again, get an aeoturbine 3030. youll freakin love it.
Joined
·
1,849 Posts
i dont agree, i think 3" duals would be ideal for that setup! with an x-pipe, and some good mufflers. long tubes would be great, but since you already have the shorties, they will work fine. dual 3" would be a little much for a mildly modded motor, like said, but i wouldnt consider a 390+ engine with a supercharger mild mods.
Joined
·
924 Posts
3" is complete overkill. Unless hes making 650+rwhp then he doesnt need it. Look at Dave D he was pushin almost 600rwhp and he was running 2.5" duals if i remember right
Joined
·
2,364 Posts
Use the guide below when calculating pipe size for custom exhaust work. Keep in mind that the goal is to improve exhaust flow. In most cases, just changing the restrictive OEM muffler and replacing it with the same size straight-through Performance muffler will do the job. To reduce additional backpressure, the OEM exhaust tubing can be replaced with mandrel-bent tubing of the same size or one size up from the OEM. As a general rule, you can enlarge the pipe diameter of your OEM exhaust system by 1/4 to 1/2-inch to increase your horsepower. However, any additional increase in pipe diameter is likely to decrease your performance; specifically, low end torque.
ENGINE SIZE HORSEPOWER MUFFLER INLET/OUTLET
Single Exhaust Dual Exhaust
150-200 CID 100 to 150 2" to 2-1/4" 2"
200-250 CID 100 to 200 2-1/4" to 2-1/2" 2" to 2-1/4"
250-300 CID 150 to 250 2-1/2" to 3" 2" to 2-1/2"
300-350 CID 200 to 350 2-1/2" to 3" 2-1/4" to 2-1/2"
350-400 CID 250 to 550 3" to 4" 2-1/2" to 3"
Use as a general guide for engine size and performance
taken from http://www.longbeachmuffler.com/faq.html
ENGINE SIZE HORSEPOWER MUFFLER INLET/OUTLET
Single Exhaust Dual Exhaust
150-200 CID 100 to 150 2" to 2-1/4" 2"
200-250 CID 100 to 200 2-1/4" to 2-1/2" 2" to 2-1/4"
250-300 CID 150 to 250 2-1/2" to 3" 2" to 2-1/2"
300-350 CID 200 to 350 2-1/2" to 3" 2-1/4" to 2-1/2"
350-400 CID 250 to 550 3" to 4" 2-1/2" to 3"
Use as a general guide for engine size and performance
taken from http://www.longbeachmuffler.com/faq.html
1 - 9 of 9 Posts
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
