today I got a few dyno pulls and put back the 2.8 upper pulley instead of the 3.0, also replaced the stock fuel pump and fuel control module as it was running lean before, we also put back the KB BAP and it helped to have a safe AFR

the dyno gauge is reading 10-11PSI, my gauge on the pod reads 13 for some reason (AEM)

these videos are after 5 pulls and the dyno fan wasn't on, the supercharger was hot and I should have higher numbers than 420RWHP - 520RWTQ

the dyno guy told me that my exhaust is restricting the increase in HP, can you guys confirm?

dynatech LT headers aren't the problem but
high flow cats should be replaced with straight pipes?
current setup is 2.5in pipes and they suggested 3in pipes?
I have a "fake" dual, basically single in, dual out, should I go true duals?
current muffler is dynomax superturbo, they recommended something else like flowmaster or magnaflow, I personally don't like those 2 brands, what should I get without getting drone noise?

Thank you for you help!


cluster is in kmh, not mph

 

https://www.f150online.com/forums/su...d-exhaust.html

Try this link from a few months ago. Lots of good advice.

 

Cut the exhaust at the y-pipe and have an x-pipe installed. Run 2.5" duals with mandrel bends he rest of the way. You want a stainless steel muffler with a straight through design such as Borla or CM performance. https://www.cmperformanceexhaust.com
Problem solved. True dual 3" is to large. You will lose velocity which will in turn reduce scavenging and cost you.

Sorry to say 420-440rwhp is all you're going to get at 12psi with the Heaton. Even with a snakebite kit. What was your fuel consumption at WOT? Dyno guy should be able to tell you. I would say you're at 6lbs per minute. Need to know for sure.

 

I have LT headers and hi flow cats just after the headers so I just need an exhaust from the hi flow cats
so JDM told me to do this, need feedback as it it getting expensive..
dual 2.5 pipes, magnaflow straight through muffler with an x pipe in front of them.

"problem" is that I can't find any kit doing that (help needed please!) and custom making it would be $1200 with stainless.

thoughts?

 

Widji:

That is EXACTLY what my exhaust is. I got it done for $273 at a local speed shop. The muffler was like $128 of that. Guy was unreal cheap. But I live in NE. Magnaflow Muffler with built in x pipe is #12568. I took the guy 45 minutes (all welded etc.) I have no cats with my long tubes, just resonators. 2.5" from the headers did lose a little bottom end in my opinion as opposed to the Y pipe into the single in dual out I had before. The Magnaflow sounds much quieter though. Overall is good.

 

Is there a difference between 1 muffler like this one and 2 pipes going in vs 2 separate mufflers?

 

I've had all the setups. I started out with stock manifolds and cats in to a Magnaflow cat back system. Single in dual out. Works great to around 400rwhp. I then went with dynatech LT's in to Magnaflow high flow cats then an x-pipe and then in to the Magnaflow muffler 2.5" dual in dual out. Worked good but the Magnaflow didn't hold up long. Thats when. I switched to all stainless tubing, mandrel bends, and dual mufflers. By far the best investment. Running 12.3's on this setup makiking well over 500rwhp, and dropped my exhaust temps by 20-30 degrees just crusing at 60mph. Dropped them 80-100 degrees crossing the traps of the quarter mile. Cooler temps mean you can run more timing and make more power. $550 at CM Performance in Ft. Lauderdale. http://www.cmperformanceexhaust.com

Keep in mind if you are not going to have the 2.5" done with mandrel bends you are wasting time and money. The crush bends on the 2.5" pipe will make your system perform like a 2-2.25" system.

Check out my photo album for pics of my various setups https://www.f150online.com/forums/me...st+system.html and my thread featuring my best setup. https://www.f150online.com/forums/ex...-complete.html

 

I once again will argue "lower end" power loss..

Our factory stall can flash at 2800... You won't notice that "lower end" while or spirited driving. You won't notice that "lower end" while putting around because you are putting around.

 

that is good info thank you

do I have to put the exhaust tips on the side or do you think I could reuse my existing catback without the existing muffler or would I loose power?

 

You could certainly use the exit set up you have now. No impact on performance. Just make sure she's 2.5" all the way and no crush bends. I like the side exit for appearnace and when you roll down the back window and nail it the sound is amazing.

 

Yes latest setup is the 2.5" system with Mandrel bends and CM Performance mufflers. No dyno runs of just exhaust verses exhaust. I don't think it would be worth while. Dyno runs can fluctuate from hour to hour, from one tank of fuel to another by 7-12hp. I compare at the track and with data collected. So heres a quick comparison.
2.5" Crush bend system with 1 Magnaflow 12456 muffler. (Dynatech LT's, Magnaflow high flow cats. X-pipe.)
EGT's at 65mph: 1350F.
EGT's crossing the traps 1600F.
Boost 12-12.45psi.
Best quarter mile 12.7@106

2.5" Mandrel bend system all Stainless Steel with 2 CM Performance mufflers. (Dynatech LT's, Magnaflow high flow cats. X-pipe.) additional mods: 90mm throttle body with 4" intake, Jabsco intercooler pump.
EGT's at 65mph: 1320F.
EGT's crossing the traps 1490-1500F.
Boost 11.5psi.
Best quarter mile 12.4.@109

As you can see substantial improvement everywhere. People worry about losing a little boost but you can see the truck was much happier and making a lot more power. When I pullied for 13psi she hit 12.3@110. Could have easily been an 12 flat run but traction was big issue that day.

Will try again soon!

 

so I found a shop nearby that can do mandrel bends for exhaust

only problem is in 2.5in they only do aluminum and quoted me $650 while in stainless steel they can only do 3in and that would be $900

what would you suggest me doing? for some reason they can't do 2.5 stainless steel..

last question, for muffler which one is the best? magnaflow, CM or borla?

 

I'd stick with 2.5" unless you plan to lay down 500-600rwhp. CM Performance or Borla for the muffler. Both SS and both are straight through. They look identical. Just slight soze variations. The guts of the Magnaflow lasted about 18 months in my truck.

 

Can I lose HP if I go with 3"?
Should I really avoid aluminum?

 

You can lose velocity which will reduce scavenging. (I don't personally know if dual 3" is large enough to lose scavenging or not in your application.) If scavenging is incomplete, the following stroke will begin with a mix of exhaust fumes rather than clean air. This may be inadequate for proper combustion, leading to poor running conditions such as four-stroking.
More on the subject here.
http://www.dsmtuners.com/forums/frequently-answered-dsm-questions/168578-exhaust-straight-scoop-backpressure.html

Nothing wrong with aluminum. If Stainless is an option thats what I choose for the longevity.