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#1 |
Registered User
Join Date: Sep 2006
Location: Riverton KS
Posts: 832
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Anyone running 70 Series Flowmasters?
Looking to see if anyone has went from 40's to the 70 series.
First a little info on my current setup: 355c.i. RPM aluminum heads, 284 Comp XE cam, full length headers, 2.5" exhaust (no x or h pipe) with FM 40 series dumped in front of the axle. While this setup sounds great to me, I would like to tone it down just a bit. I still want to keep it dumped in front of the axle. Before I spend 300 bucks I wanted to see if anyone had any experience with this swap. All the videos on you tube don't demonstrate the difference in interior drone. And that is the main reason I would like to try something quieter. Thanks for any input.
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1970 SWB Build |
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#2 |
70+ ( Old Skool Club )
![]() Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,118
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Re: Anyone running 70 Series Flowmasters?
subscribed
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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#3 |
Senior Member
![]() ![]() Join Date: Sep 2008
Location: Harrison, Arkansas
Posts: 9,815
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Re: Anyone running 70 Series Flowmasters?
I picked my 71 GMC Longhorn from the muffler shop this afternoon. It is a big block with stock manifolds. I had Flowmaster 40's with the exhaust in front of the wheels. Was a little annoying. I had the exhaust run out in the stock location, and retained the Flowmasters. It is quieter in the cab and sounds perfect.
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#4 | |
Registered User
Join Date: Sep 2006
Location: Riverton KS
Posts: 832
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Re: Anyone running 70 Series Flowmasters?
Quote:
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1970 SWB Build |
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#5 |
Registered User
Join Date: Aug 2013
Location: Mahtomedi, Minnesota
Posts: 335
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Re: Anyone running 70 Series Flowmasters?
Have them dump right behind the bumper, so you can't see the pipes, and you get that extra distance from the cab
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Austin 2005 GMC Sierra 1500 4X4 4.8l V8 (Wrecked) 2003 Chevy 1500 standard cab short bed 4x4 w/ 5.3l |
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#6 |
Registered User
Join Date: May 2009
Location: Goldsboro NC
Posts: 151
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Re: Anyone running 70 Series Flowmasters?
I'm running Delta 50's dumping out behind the rear tires.
They're sort of quiet, but could still be a little quieter. I use to have 40's. I just couldn't stand that drone. |
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#7 |
Registered User
Join Date: Sep 2006
Location: Riverton KS
Posts: 832
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Re: Anyone running 70 Series Flowmasters?
Well, I went ahead and ordered the 70's. If I can figure out how to post videos, I'll post some comparison videos. I'm anxious to hear them compared to the 40's.
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1970 SWB Build |
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#8 |
Registered User
Join Date: Oct 2012
Location: Green Valley Arizona
Posts: 1,351
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Re: Anyone running 70 Series Flowmasters?
Subscribed...I also have 40s dumped just before rear axle. Like to hear what yours will should like with the 70s
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1970 C10 Short Stepper with 71/72 front clip. |
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