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#1
03-10-2005, 07:04 PM
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Pros and Cons of Duel Exhaust.
I have a 1991 Chevy Silverado with a 350 in it. It still has the cat on it but where I live we don't have to get those emission tests before we get tags, so im not worried about cutting it off. I have heard that duel exhaust will eat more fuel and give you less power, any truth to this? I have been thinking about dueling it out for a long time now but the thought of it drinking even more gas is a bummer. I don't want that Y'ed off bull**** where 1 pipe Y's off into two. Any reccomendations?
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#2
03-10-2005, 07:27 PM
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Re: Pros and Cons of Duel Exhaust.
Going to a dual system especially on a 350 with the cat removed will definetly increase the hp and fuel mileage. I am not saying that it is going to be a huge savings, but you will notice a differnece. Also another good addition for helping in the hp and fuel mileage is a k&n filter at the least, if not an entire cold air intake setup of some kind. I used to have an 88 K1500 jimmy and noticed a big improvement in low end throttle response by upgrading to a k&n air filter.
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**2007 Avalanche LT. **  6" Pro Comp lift 305/55/20 BFG A/T KO'S K&N FIPK GENII Flo Pro V force muffler & 4" slash cut stainless tips Color matched front and rear Bowties 3" polished stainless bull bar and Nerf bars
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#3
03-10-2005, 08:42 PM
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Flowmasters?
Is Flowmasters any good? They guy at the exhaust shop seemed to be a total flowmaster freak, going on and on about how great it is....then he said "we start with "3 pipe into a duel outlet flowmasters muffler and Y them either to the sides or the back, whatever you prefer." His estimate was 250$ **** that...... Are stright pipes any good? I can get a duel stright pipe setup for 75$ from a guy a few blocks from me. You need some kind of resistance in the exhaust system don't you?
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#4
03-11-2005, 04:44 PM
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Re: Pros and Cons of Duel Exhaust.
Anyone?
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#5
03-11-2005, 05:14 PM
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Re: Pros and Cons of Duel Exhaust.
I just went with the Meineke Votex's on mine. VERY happy with them. The Flowmaster's are also good, but a little louder than I wanted. Check out the Vortex, it's fairly reasonable, good warranty, and a GREAT sound. Oh yea, watch out for the whole "Federal law" thing when removing your Cat, regardless of where you live, it's gotta be on there. Just FYI.
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#6
03-11-2005, 11:34 PM
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I may be wrong here but aren't there oxygen sensors in the cats?
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#7
03-11-2005, 11:39 PM
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Re: Pros and Cons of Duel Exhaust.
No, the O2 sensors are before the cat on his model. Some newer ones also have post cat sensors to monitor catalytic converter efficiency.
__________________
'04 Cavalier coupe M/T 2.2 Ecotec Supercharged 14 PSI boost, charge air cooler, 42# injectors Tuned with HP Tuners Poly engine/trans/control arm bushings Self built and self programmed progressive methanol injection system
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#8
03-15-2005, 05:37 PM
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Re: Pros and Cons of Duel Exhaust.
What about stright pipes? I heard that if you run stright pipes it reduces HP and makes you guzzle gas.....I can get stright pipes for cheap but, if its going to eat gas and make me loose hp forget it.
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#9
03-15-2005, 09:58 PM
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Re: Pros and Cons of Duel Exhaust.
the ultimate set up for your truck is true duals from the block
after u run the true duals, let it run for a while to get real heated up and using a IR thermometer, find the hottest place on both pipes(where the exhaust pulses stop) and put a x pipe right there. use flowmaster mufflers or the equivalent it doesnt matter whether u run straights or not as far as gas mileage goes the only thing i think your gas mileage would do is increase, by the least bit u probly wont notice it.
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#10
03-15-2005, 09:59 PM
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Re: Pros and Cons of Duel Exhaust.
by the way, true duals will not hurt your power, they will only increase it
and keep the cat, but if u really wanna get rid of it, id atleast go with a high flow cat
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#11
04-26-2005, 01:46 AM
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Hey I have a 2000 Silvy with the 5.3 and my duals sound great. It's got true duals from the cats back and no mufflers. My friend and I (an excellent welder) cut the pipe right before they come together and ran new pipe from there. I started out with 40 series flowmasters but it wasn't enough for me
 so we cut em out and put in straight pipe. I was just fortunate enough to have 2 factory cats so I didn't have to buy another.
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PFC. Nick Spry 12/13/84--2/14/04 "How I Wish You Were Here"  2000 Silvy 4x4 3" PA Body lift 285/75/16 BFG AT's K&N intake True Duals, No Mufflers 2 10"Rockfords under rear seat facing out
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#13
05-22-2005, 02:42 PM
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Re: Pros and Cons of Duel Exhaust.
Tell me if I'm a dumb $ss but I just cut off the muffler on my 2000 5.3 and it put a pipe in place of the muffler. So your telling me that it will not reduce MPG nor horsepower?
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#14
05-22-2005, 03:13 PM
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Re: Pros and Cons of Duel Exhaust.
Quote:
__________________
   "When I step on the gas, I want people to think the world is coming to an end!" - Homer Simpson 2002 ECSB, Nelson Tune, LS1 electric fans, 145A alternator, K&N FIPK, 160º T-stat, TB coolant bypass, Corvette servo, 4 headlight mod, blue LED gauge cluster
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#15
05-22-2005, 11:29 PM
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You do lose power when running straight pipes.
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*Under Construction - New sig to debut*
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