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Exhaust Mod's

rlcole321

By rlcole321
in Engines & Drivetrain

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rlcole321 Enthusiast

rlcole321

Posted
Posted

I have a 2018 rado L83 short bed, I'm looking to the forum for some feedback for exhaust mod's, mainly the do's and don'ts from what other people have done or tried but improving power(but not robbing from the bottom end just to give it to the top end).

Mainly from the cat back, but also trying short tube headers to connect to the stock cat configuration, and with and without the "Flapper" valve. Please give some feedback, thanks.

pokismoki Senior Enthusiast

pokismoki

Posted
Posted (edited)

yeah, leave the stock manifolds on the truck, they are tuned to increase torque at lower rpm, headers are for high rpm power . if you want headers use 1- 3/4" on the 5.3 motor, dont get sucked into the 1-7/8" your gonna loose toque

 

i would remove the factory 3rd downstream cat, but keep the two upper cats, this shouldnt effect any CEL light, because i dont believe there in any o2 after the 3rd cat

 

cut out the flapper valve if you got one after the muffler on your model truck.

 

 

Edited by pokismoki
rlcole321 Enthusiast

rlcole321

Posted
  • Author
Posted

Yeah, I knew about the 1 3/4" tubes to keep the low in torque, but you think there's no improvement under Nat. Asperated operation. What about other mod's, I'm considering the muffler replace w/ Open flow and no Res. or straight pipe leaving the Resonator.  Any comments or have dome's.  I may be going supercharge letter down the road for this truck. 

  • 2 weeks later...
M1ck3y Senior Enthusiast

M1ck3y

Posted
Posted

My truck never ran better (wot) then when it was all stock except for a corsa catback. That is until Gm's updated tune, which was supposed to fix transmission shifting harshness took the life out of it. 

 

Since then its been tuned and has Kooks headers. These headers are great low-mid rpm, especially when it's running hot. They pull alright at high rpm/high speed too, but it low-mid where they shine.

 

imo if you want to be quick, get a blower and call it a day. If you want people to hear you, get full exhaust.

 

And if your made of money... stroked lt1/l86, twin turbo, upgraded driveline... 😀 

  • Like 1
MikeBMW Senior Enthusiast

MikeBMW

Posted
Posted
1 hour ago, M1ck3y said:

My truck never ran better (wot) then when it was all stock except for a corsa catback. That is until Gm's updated tune, which was supposed to fix transmission shifting harshness took the life out of it. 

 

Since then its been tuned and has Kooks headers. These headers are great low-mid rpm, especially when it's running hot. They pull alright at high rpm/high speed too, but it low-mid where they shine.

 

imo if you want to be quick, get a blower and call it a day. If you want people to hear you, get full exhaust.

 

And if your made of money... stroked lt1/l86, twin turbo, upgraded driveline... 😀 

Sure, but if you want your neighbors to not hate you, just get a Borla exhaust installed by the dealership.
Still sounds great and no one hates you, except for that person you pass as you kick down the accelerator.

 

pokismoki Senior Enthusiast

pokismoki

Posted
Posted (edited)

for a daily driver dont install headers...  they do make power but at a reliability cost... there's still untapped power on the table just using and tuning with cheaper OEM parts

600-750 hp truck that cant stop or handle aint worth the money wasted on boost.. i havent seen any reliable tuning on the gen5 LS trucks that utilizes the torque tuning, all the boosted trucks are hacked tuned and may not be reliable

If you want to be quick I suggest a Camaoro SS, ZL1, or Sport bike

Edited by pokismoki
lucas287 Enthusiast

lucas287

Posted
Posted
23 hours ago, pokismoki said:

i havent seen any reliable tuning on the gen5 LS trucks that utilizes the torque tuning, all the boosted trucks are hacked tuned and may not be reliable

Not a true statement. Sure some are hacks, but there are many fantastic Gen V calibrators that are far from hack jobs and unreliable. Is it as good as GM's multi-million dollar facility for building calibrations? No, but there are quite a few folks that have it figured out. Spend some time on HPTuners forum and you'll learn pretty quickly who knows what. 

lucas287 Enthusiast

lucas287

Posted
Posted
1 hour ago, pokismoki said:

problem is getting free time to figure the stuff out, and find quality shops.. too many scammers in this hobby

Yup - unfortunately it requires an immense amount of time to figure it out on your own. You need a really solid understanding of how Gen 3, then Gen 4 operated to understand Gen 5 stuff. 

However, if your basic bolt-on like me, basic changes in HP Tuners feel really good SOTP-wise. Is it any faster? doubtful :) 

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