lost bottom end

[scrapdaddy]

i just installed a magnaflow dual exhaust cat back on my truck and i have lost some bottom end power.

how can i get that power back?

any ideas would be appreciated

[scrapdaddy]

srry guys i always forget about the search icon.

i did a search and found my answers....laughs duh...

feel free to give me your opinion tho

[NoRiceHere01]

my opinion is i lost bottom end on mine too with a dual exhaust but the peak power on the highway is sweet. my 76 never even dreamed of 6,000 rpm hahaha.my biggest bottom end loss is actually from the damn tires that r too tall. i would either like lower rear end gears or even a torque converter with a higher stall speed.those tires r goin soon tho...

[Elbert]

Originally Posted by scrapdaddy

srry guys i always forget about the search icon.

i did a search and found my answers....laughs duh...

feel free to give me your opinion tho

so what was the answer to the lost power....how to get it back?

[kenny-1907]

You lost the low end torque because you took away some of the back pressure in the exhaust system. There is really nothing cheap you can do. Sometimes the power will come back on it's own after the computer has re-learned the new parameters or it may not. Adding a K&N Fipk may help, but possibly only after the computer had re adjusted it self again. Adding long tube headers i heard helps, getting a tune of some kind would help for sure, but these all cost a fair bit of money. Some people say keeping the single inlet exhaust and just adding dual outlet helps keep that low end torque but i wonder if you get as much of the top end gain that way as going to a true dual. I agree with NoRiceHere01, there is a definite power increase top end with a true dual system.

[scrapdaddy]

thats what i have bought its a single inlet dual outlet exhaust system. there is noticeable power at the top end. but no bottom end.

[tykrz]

I hate to say it but re-install the old exhaust system. I don't know about all these mods....exhaust, pcm tunes, air intakes, etc. Manufacturers spend billions of dollars in research and development on products and then we come along and try to reinvent the wheel. I think these trucks run best when we dont monkey with them. Bottom end torque is more important than a teeny bit more power at 6000 rpm. How often do we drive at 6000rpm going down the highway?

[NoRiceHere01]

depends on whos next to u... seriously tho, im not tryin to reinvent the wheel, manufacturers spend money to make the trucks competetive with other brands and to make them reliable, not to maximize horsepower or make them sound great.and i think headers r just gonna do the same thing, add hp not torque.it sounds to me like the engine just needs to be more powerful. and unfortunately other than intake, exhaust, and pcm tunes, this goes beyond bolt ons. even tho theyre modern engines, theres still only so much u can do with stock cams and valvetrains.u can always build a sick 6.0 like slowproccess lol

[kenny-1907]

I disagree with tykrz. Sure they spend billions on R & D but it is also R & D on how to also save them self money when it comes time to manufacture the vehicles CHEAPLY. Think about how much money they save by using a single muffler type system. Take a look at the mid 90's trucks that were having problems with their wipers not working because of cheaply soldered joints on the circut boards, same thing with the push button 4x4 selecter switches, cheap. If they can save 20 cents per part for something like a switch, do you think they care that it is because they use a lesser grade of solder or a less amount of solder ? All they really care about is how much it will cost them to make versus how much they get back in return from selling it. Another problem is they do not want to produce a vehicle from factory that has gobs of horsepower and torque that just about anyone can afford, they save that for the "speciality" vehicles that they can charge alot more for for just that reason, it's performance. When it is a matter of what, they spent a little more and put dual exhaust on it, installed a free flowing intake and the programming in the computer is different (tuned), imangine that, that is just what we are trying to do our selves for alot less than a dealer would charge for the same if not more performance. So really in a way i guess you can say the dealerships are smart, not cheap. They want you to pay for off the floor performance. Like they say horsepower costs money, how fast can you afford.

[tykrz]

I agree in some respects. I still stand that not much can be done to re-tune engines to make more HP/TQ and MPG. Auto makers try to engineer a happy medium so a truck gets the most amount of HP/TQ along with the best MPG possible for that combination.
These aftermarket add ons mess with that combination as proven by scrapdaddys initial thread.

[siverado05]

I had the same problem with my 05 5.3. Adding a cold air intake really helped alot. I got back the low end power and still had great top end.