.....has the 3" pipes changed my backpressure negatively.

Here's the scenario:
2007 5.4L Crew
K&N Intake
Flowmaster Catback 3" pipes

Wanted to get exhaust to combo my intake, and feel that the 3" pipes have actually made my truck less powerful when I "get on it." My question is, if this is true would I even notice a change in power? And it's not dual exhaust, so hopefully you guys will say "Split, it's just you. Your truck is actually faster, its the sound making you think it's slower."

Thanks guys again for the support

 

Firstly, back-pressure is a myth.

Secondly, if you feel a performance hit, it's not from the 3" intermediate pipe. The Slowmaster might be. Unless you cut the OEM Y-pipe out and installed one that exits in 3", you wouldn't have had any noticeable performance gains.

 

i have to say it is just you, but when the exhaust gurus find this they will bash you for believing in backpressure

 

gee wilikers punisher u beat me to it, i overlooked the fartmaster tho woops

 

Switch to a performance designed muffler, not a hollow can that makes air toned wom-wom andwater gurgle noise, and the Y pipe would be a great change too.

 

And while yer at it, either remove that POS K&N, which is not doing much of anything useful, and is very likely not safe until you get a proper tune for it.

3V's and WAI's do not mix with the stock calibrattion or canned tunes with no MAF TF support. This has been reitirateed countless times on here - and very recently.

MGD

 

Exhaust gasses will die with a three inch pipe. Good for mid to top end but bottom end not so much. You dont lose anything it just moves your power band up i.e. peak torque goes from maybe 3600rpm to 4000+. All depends on how much pipe you have @ 3" though...

 

With these oughtta take car of the torque issue though

 

^real nice maggy y u got there!!

 

Why thank you, if only I could find an adapter that goes from 3/4 x 16 threads per inch male to 1/2 x 16 male i'd be set. That EGR issue is a BI$*%!

 

I was reading on another forum for a certain Bowtie manufacturer where a guy did a baseline dyno tune, did one after an aftermarket CAI, then another with a Borla system. He lost 50 ft.lbs of torque in midrange with the Borla exhaust and -7 ft lbs at max torque! Holy crap!

 

Link?

 

x2 on the link


because there's a lot more this story than what just been posted, exhaust size, muffler, timing, etc


without the dyno sheets and the datalogs I'm calling BS

 

YES, you cost yourself a bunch of torque which in turn makes teh truck slower, this is yet another reason people need to RESEARCH the mods before they make or purchase them

 

Thanks everybody for all the replies. Obviously, my ignorance shows I've been outta the game for quite some time. Thanks for all the feedback. Learning all over again.