aight thanks and shifty i say u go for it

 

I want straight pipes but I'm worried about this back pressure issue. I will still have my 4 cats and then the y-pipe then straight pipes after that.

 

You will be fine with that setup.

 

**** back pressure? should i be worried or will i be fine, got the same setup as the guy above

 

Back pressure is a Myth...its about Exhuast flow rate.... the 4 stock Cats offer plenty of back pressure but your truck will run alot better with out the stock muffler because it can have a higher rate of flow without resctrction...pretty much the exhuast is a gas...and it wants the easyest and fastest way out...the stock muffler is HUGE!! and is so restrtive it hurts performace...like i said ull be fine... just saws all that thing off and leave the pipe were it is...maybe throw a turn down on there or something...but you will be fine.

 

Hmm, if you drive your truck at high RPMs and race all the time, sure you want maximum airflow and sacrifice everything else. However, most of us drive our trucks at lower RPMs, where back pressure is no myth.

Shifty you run true duals 3" correct? i bet if you down it to 2.25" and put high flow cats on, you would gain considerable torque down low on a dyno.

And btw, cutting off the muffler will not gain you power. That's a poor argument.

 

i know you wont add power from it but you wont feel the loss on the butt dyno and you will gain some MPG's At least i did?

Yes i run pacesetter LT's into 3" true dual dynomax bullets dumped. and a dyno will show what i picked up even with 3" pipeing once i get 80 bucks i have the dyno graph of Pacesetter shortys with Dynomax super turbos 2.5" pipeing True duals dumped *no cats* its in my sig... once i get the money i will get it dynoed again and see the HP and TQ i picked up...This is the dyno with the shortys

 

He's right shifty. The "Myth" you refer to, is just how some have thought of it. IMO, you took all the fun/pleasure out of vehicle performance under normal circumstances. Your only benefit is @ WFO. That's no fun, not for me anyway. I also think you shortened your vehicles lifespan. There not designed to run this way - far from it.

I don't think they can even Dyno tune it back in with your set up - It's out there, way out there .. Tried to tell yuh that before you did it ..

 

ill see what the guys that do the Dyno tuning say. and i can always Reduce the pipe size. i will have them do the EGR delete and Rear o2 delete too so my CEL will be off all the time *got a scanner today and the CEL is on for would you know it EGR issfent flow cleared it so the CEL is off for a lil*

im getting an acually EGR block plate next week so i can get my 3/8th extention back from my EGR pipe!!! haha

Once i get some money for dyno tuning ill take a trip back down there and ask them what they say about the set up... Jbrew i could have swore you even said something to what i said...that back pressure isnt what its about but Exhuast flow rate..... thought you said somthing along those lines.

sure he'll lose like 3-5 HP and FTlbs... but for the sound of no muffler and pick up 1-2 MPG i think its worth it and its the cheapest way to get it to sound... like a V-8 without throwing codes.

Would it really hurt the truck that much to run No muffler? or are you refering to how my truck is set up ?

 

Well, Bavarian Motor Works (BMW) has the fastest production car on the planet. They just televised that recently and showed all the runs. Damn - those things will run 7's right from factory, w/stock tires My sis just traded here 10 year old beamer in for a new one - I liked the old one better personally and NO - She didn't get that $200,000 fast one lol - Wish she did ..

Why I mention the BMW - It has a neat feature that is electronically controlled toward the rear of the exhaust. It's call something like Dynamic Back Pressure reduction. Like I said, it's electronically controlled and not sure how it works totally- haven't looked it up yet. But, they did say on television it's used when required and only at high Rpms. I thought that was pretty cool.

What I'm trying to say- Your trucks current high flow rate isn't really needed for a stock motor- Off Road piping is 3" but only focuses on high RPM gains. - Doesn't work down low - say 2500 rpm and lower. Normal operating Rpms.

A 3" pipe set up is the off road set for close to stock motors and above. You have LT headers and a straight back 3" dual set up right

Your truck is going to have great MAX power numbers, BUT at what range? Pay attention to where in the Rpms your making everything happen, specially where max torque #'s are at. My max torque is @ 2500 RPM - 2500/2700 is optimal ranges for overall drivability/workability improvements for a truck to be used as a truck IMO. That graph/chart you posted above can't handle my torque numbers and I'm close to stock - Damn charts not tall enough ( :

Peek numbers are always impressive looking, and work well in an all out race at high Rpms. But when your actually driving the vehicle - The fun power/torque is down low. That's another BIG reason a gear swap is the best Mod IMO . It gives you everything IF you make the right choice. It may seem expensive, but for what you get - it's unmatched dollar for dollar when it comes to mods and improvements overall.

 

i think you will like it. i would cut the exhaust off and put a peice of long pipe in there and keep the exhaust exiting where it does not i think ths is going to be my next set up. lol i have no luck with exhausts.

 

ah ic see Jbrew... once i get a custom Dyno tune and maybe even a turbo *ill explain farther down* maybe ill pick up the lower Ft lbs back from my set-up i donno i just like the sound and the butt dyno only felt the pick up from the LT's did feel a loss from the 3" pipeing... oh well.

So the guy that posted about superchargeing for cheap i was reading around on the STS turbo thing and that looks pretty good and easy *they say easy as a cat-back install* *if never put anything behide my cats expect turn downs so it should be pretty easy ah? * and i sent them an Email asking about it for my truck and the guy called me one day and said They are just now making a kit for the 97-03 F-150s and he will keep me updated on how the progresses is going and he will let me know when the kits done and he may even cut me a good price because i will be one of the frist 5 people to ever put that kit on the 97-03 F-150s *so im pretty much the test guy * but im going to have to get rid of my drivers side muffler and Y-pipe it cuz the turbo only has one inlet. Then im going to Split it after the turbo and run tips at 45 from behide my tires *This is all very very far away but its good to have a plan* hehe i think with a Turbo Jbrew ill be able to take your truck Once i get dyno tuned with my LT's will line them up... Then after i get that STS will line them up again STS really has there stuff togther and i really like were that turbo mounts!!

 

I looked at the setup from STS and liked it, but after I heard the way they sounded, I was not as big of a fan. They sound cool, but I want my truck to be a sleeper, not sound like a 747 winding up at the airport. The idea is good, the price is unbelievable, and the performance and ease of install is like no other, but I want to be incognito about my turbo(powdercoated black piping and intercooler) and a single 3" exhaust out the back. Just the normal looking worn out 98 4x4 F-150 with a lil ole 4.6L

 

yeah i love the sound of Turbos i think there is a way to make them quiter... i know on some turbos *my friends have diesels* you can take something off to make it whisle liek 100X's louder...

i wouldnt mind if people knew my truck had it... it dont matter i put all that time in money into it id want people 10 Miles away to hear that thing whisleing!!!

With the STS turbos i dont think you have to run an intercooler because of how long it takes for the air to get back to the engine... *i could be wrong* But yeah when he calls back with the price im gonna have to work a ton to get that much money but it will be so worth it!! and im gonna ask him to make it super loud!!! haha

 

well i cut it off today and it runs fine, no loss in torque wat so ever and it sounds amazing