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05-09-2009, 11:11 PM #1
dual 40 series!!!low back pressure????
aloha everyone!! so recent upgrades include a set of hooker comp headers and dual flowmaster 40 series exhaust! all of this on a stock 305... the truck sounds good at idle, but get on the gas a little and it sounds like a train coming through! but at the same time, it feels as though it lost some power on the low end, the truck makes a whole hell of a lot of noise, but doesnt seem like its moving the way it should. any ideas??? did i go too big on the exhaust??? thanks!!!
Beltech 4"drop front soon to be 6" on the back
true dual 44 flowmasters
Hooker comp headers
20" zenetti throwback wheels
2 kicker 10" subs
alpine mono 500w amp
jl 4chan 500w amp
05-09-2009, 11:26 PM #2
Did you run the exhaust all the way out. Also what gears do you have in the truck. You cant expect a 305 to just blow the doors off. You may not be getting as much air in as you a pushing out. I suggest getting a cai.08 silverado
single in dual out cherry bomb pro
custom painted bow ties
20inch Cruser Alloy Switchblades
Goodyear Eagle GT2 285/50/20
1 truly heavy foot + Wait4meperformance SCT Handheld
100 shot of Nitrous Dyno tune system
SS front bumper
Matching painted front grill and bow ties
05-09-2009, 11:30 PM #3
the gears are stock gears, not too sure of the ratio... i have a k&n airfilter in it...did you change the gears in yours? i was thinking of doing the gears, but not sure what to get... i know i want to change it to a posi, but for the ratio, maybe a 383??
05-09-2009, 11:32 PM #4
oh yah, cai? what is that?? sorry, i think i have to do more homework on this stuff... haha!!
05-09-2009, 11:38 PM #5
i got it!! cold air intake... hahahaha!!! what a rookie!!!
05-09-2009, 11:44 PM #6
i have the same problem, you need to google about BACKPRESSURE and read up on that. im not going to try and explain it but it can have some negative effects on torque when you change the exhaust from stock, depending on how its done.Scott-Mississippi
*Mostly stock for now
*Soon to be airbag project..
05-09-2009, 11:56 PM #7
Are your headers shortys or long tube? How big of pipes did your run and how was the exhaust set up?99 K1500 Suburban LT "THE BEAST"
Hypertech III, K&N, true dual
05-10-2009, 12:01 AM #8
thanks for the info! it just sounds like the straw is too big for the spitwad! haha! now how to correct that is another thing!
05-10-2009, 12:04 AM #9
the headers are full length, the pipe is a 3" up and over the rear end not quite a 45 to the tips. but it is a true dual. from the headers, both individual pipes run to the passenger side of the truck, then straight back. right behind the tail gate, the pipes split to 45s then down. does this make sense??
05-10-2009, 12:11 AM #10
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