Dual pipes on a F-150
09-28-2017, 02:10 PM
#21
Just a gearhead
you WILL gain mpg's with a flow through muffler.
09-28-2017, 02:17 PM
#22
Texas A&M Aggie
the mufflers we have are NOT straight through and I have the video to prove it.
you WILL gain mpg's with a flow through muffler.
https://youtu.be/oSSVO61a6N8
you WILL gain mpg's with a flow through muffler.
https://youtu.be/oSSVO61a6N8
09-28-2017, 02:31 PM
#24
Here's a *before* picture. Those are 2.5" factory cat dual headpipes (well before the OE resonator) to a 3" collector, but with a 2.5" collector flange on the downstream side; this is OEM. Then there's the OEM 2.5" tubing, the OEM 2.5" resonator, more OEM 2.5" tubing then the 3" in/out Series 70 Flowmaster that was installed here three months ago... and finally the OEM 3" mandrel-bent tubing over-axle tailpipe...
09-28-2017, 02:41 PM
#25
Senior Member
Makoto - the mufflers we have are NOT straight through and I have the video to prove it.
Can't speak-for the others.
.
09-28-2017, 02:45 PM
#26
Just a gearhead
09-28-2017, 03:57 PM
#27
Renaissance Honky
If'n you wanna get stupid, keep it dual 2.5, to an X, to dual tails. Add mufflers to taste. That would have a nice rip to it.
09-28-2017, 11:06 PM
#28
5.0 DOHC V8
Join Date: Apr 2017
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ZeroTX
Wait, so even if we install a full aftermarket 3" cat-back, we are still bolting it to a 2.5" collector??
Wait, so even if we install a full aftermarket 3" cat-back, we are still bolting it to a 2.5" collector??
I would *think* that a reputable aftermarket exhaust would supply the downstream flange as 3".
They took mine, cut off the 2.5 tubing, then put the flange on an hydraulic expander... I joked with them that I was going to bust out the dial calipers, but was assured that the flange i.d. was 3" and that, previously, 2.5" tubing had been factory-flared then welded on. It's all 3" now from the collector flange to the tailpipe.
Here are the before and after photos...
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chimmike (09-29-2017)
10-23-2017, 02:08 PM
#29
Busy day.
I would *think* that a reputable aftermarket exhaust would supply the downstream flange as 3".
They took mine, cut off the 2.5 tubing, then put the flange on an hydraulic expander... I joked with them that I was going to bust out the dial calipers, but was assured that the flange i.d. was 3" and that, previously, 2.5" tubing had been factory-flared then welded on. It's all 3" now from the collector flange to the tailpipe.
Here are the before and after photos...
I would *think* that a reputable aftermarket exhaust would supply the downstream flange as 3".
They took mine, cut off the 2.5 tubing, then put the flange on an hydraulic expander... I joked with them that I was going to bust out the dial calipers, but was assured that the flange i.d. was 3" and that, previously, 2.5" tubing had been factory-flared then welded on. It's all 3" now from the collector flange to the tailpipe.
Here are the before and after photos...
10-23-2017, 03:36 PM
#30
