Thanks bud! Actually, about 9 years ago I did the whole system from manifolds back, true duals with two flowtech mufflers. This year when I re-did it, my exhaust guy said I was actually losing power due to back-pressure. So i had him put the stock pipes back on the front, then run a single pipe into a single flowmaster 40 with dual outlets. Dual pipes all the way back after the muffler. Seems to run better now. I also have a high flow aftermarket cat. Hope that helps! Thanks again.
Hey...I sent a video response but wanted to ask you about your flowmasters. Where did you start from?? And did you use two flowmasters?? Or just one flowmaster to dual exhaust?
Sounds like you might need a new Fan Clutch!! Rotate the fan while the truck isnt running and see how much resistence it has to it. Shouldnt have to much resistence. Also, if that doesnt help, maybe a smaller fan?
@AureliaMetal Really? I have a 96 Suburban with a 454 that just crossed the 204,000 mile mark. Empty on the highway it gets up around 15, I can hook a trailer on it and drag a John Deere 1010 Dozer down the highway at 70mph and still get 12 mpg.
@AureliaMetal Man dude, she sounds great! i have a 99 Tahoe with a 5.7 and when i accelerate, i only hear the fan spooling up and not the engine up until about 3500rpm which i rarely hit. any recommendations?
Sounds wicked! I've always wanted a big block Suburban but I'm already hurting putting gas in the Suburban I have now that has a 350! But after hearing that, I'm definitely going to go with Flowmasters when I get around to replacing the exhaust.
Not a lot of horsepower difference between engines but the torque is great!!
AureliaMetal 1 month ago
Cool truck wish mine had a 454 in it I got the 350 vortec 16 MPG in town around 22 on highway
1212carnage 1 month ago
8 or 9 around town. Highway, the best I ever got was 13.
AureliaMetal 1 month ago
Wow!! I dream of that mileage. I have even changed the engine with a lower mileage one and still get crap gas mileage.
AureliaMetal 2 months ago
@AureliaMetal what mileage you get?
Dayberry 1 month ago
Thanks bud! Actually, about 9 years ago I did the whole system from manifolds back, true duals with two flowtech mufflers. This year when I re-did it, my exhaust guy said I was actually losing power due to back-pressure. So i had him put the stock pipes back on the front, then run a single pipe into a single flowmaster 40 with dual outlets. Dual pipes all the way back after the muffler. Seems to run better now. I also have a high flow aftermarket cat. Hope that helps! Thanks again.
AureliaMetal 2 months ago
Hey...I sent a video response but wanted to ask you about your flowmasters. Where did you start from?? And did you use two flowmasters?? Or just one flowmaster to dual exhaust?
Ps trucks awesome..........
xxxQUAZIxxx 2 months ago
Sounds like you might need a new Fan Clutch!! Rotate the fan while the truck isnt running and see how much resistence it has to it. Shouldnt have to much resistence. Also, if that doesnt help, maybe a smaller fan?
AureliaMetal 3 months ago
my 8 inch sub helps with the rumble : )
joeyf504327 4 months ago
454 sounds even better than 350 which 350 sounds better than 327
joeyf504327 4 months ago
It gets 12 MPG on a good day on the highway....
AureliaMetal 5 months ago
@AureliaMetal Really? I have a 96 Suburban with a 454 that just crossed the 204,000 mile mark. Empty on the highway it gets up around 15, I can hook a trailer on it and drag a John Deere 1010 Dozer down the highway at 70mph and still get 12 mpg.
Countryboy830 2 months ago
The 40 series are sweet. Just put a 40 on my wifes Jeep Grand with the 5.2, and it also sounds really nice for just a single.
AureliaMetal 5 months ago
@AureliaMetal Man dude, she sounds great! i have a 99 Tahoe with a 5.7 and when i accelerate, i only hear the fan spooling up and not the engine up until about 3500rpm which i rarely hit. any recommendations?
FHFCFB100 3 months ago
Sounds wicked! I've always wanted a big block Suburban but I'm already hurting putting gas in the Suburban I have now that has a 350! But after hearing that, I'm definitely going to go with Flowmasters when I get around to replacing the exhaust.
bigredchevytruck 5 months ago
Thanks!!
AureliaMetal 11 months ago
Dude!!! I like it!
hrsmotorsports 11 months ago