a little exhaust change

the situation: so, in preparation for my long tube headers, i decided to do a little exhaust work to Penny. for the past 3.5 years, i've just been running a 3" mid pipe to a dumped chambered muffler. i knew after the LTs, that was just gonna be way too much bed-rattling goodness for my taste, so i decided to add some tail pipes out the back. i've also heard the argument that with certain mufflers, you lose some low-end torque when it's dumped, so i was also eager to check the validity of that statement.

the new hardware: dual 2.25" 14 gauge aluminized steel tail pipes into 3.5"x22" t304 stainless tips

the difference: it's a little hard to tell in the video, but the exhaust note is now a little more defined & deeper. it also dropped the slight drone from ~2000rpm to ~1650rpm - which reduced highway noise @ 70mph (i can hear the radio & talk to people much easier now). it's generally much quieter in the cab - so much so that i stalled it a couple times because i couldn't hear as i was letting the clutch out. as for the torque difference, it did pick up a little in the low-end, but i believe it might've lost a little top-end because the comparisons you'll see at the end of the video still come out to the same time. the way i know the bottom of the curve is a little fatter is by the fact that i can shift at slightly lower RPMs without bogging the engine - perfect example is shifting to 3rd @ 2000rpm. before, it started bogging even with light throttle, but now i can perform the same shift with the same throttle pressure no problem.

now - for the picture show
Penny exhaust change 3/2010 video by zebra- - Photobucket

You are having way too much fun with your truck now

no........








actually, work's just picked up a little more & i'm trying to get some crap done before i go to the Camaro5Fest @ south georgia motorsports park & dragging some of my friends there. that & once i start OTS, who knows when i'll get to start playing with the truck again?

went back & watched this again


wow... sounds like a pussy now that i've had catless long tubes for the past couple years :)
it'll sound even better when i can afford the 416LS3

Post vids!

2.25"?

yes, as in two and one quarter inches in diameter.

and that link apparently changed when they reworked photobucket
http://s943.photobucket.com/albums/a...rrent=2010.mp4

i wouldnt go anything smaller than 2.5".

and let me guess - you'd also recommend a 228 cam, 1 7/8 headers & full dual 3" for a 4.8 too, right?

this is a stock 5.3. it's already got 1.75" LTs with 2.5" Y followed by a 3" mid. and if you grab a calculator, you'll see that dual 2.25" pipes have 12.5% more volume than a single 3", so actually, the bottleneck in the exhaust is the same mid pipe that everybody & their brother swears by.

I wasn't questioning the logic. Just not your typical combo. I guess I was questioning the reasoning for making it more difficult that it should have been.