_zebra

iTrader: (5)

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
http://s943.photobucket.com/albums/a...rrent=2010.flv

budhayes3

iTrader: (19)

Sounds good man...gaining down low while losing a little up top is typical when increasing pipe length while decreasing diameter. I could really hear the difference in the cab, must be nice while cruising down the highway.

2005 Silverado

iTrader: (19)

Longest video about exhaust ever. Sounds good, Are you going with a catted y with the longtubes or are you going Off road y?

_zebra

iTrader: (5)

dual 2.25" flows more than single 3", but i reckon having to go through pipes at all is more restriction than the open air

it's definitely a lot quieter inside, especially with the back glass closed. i had it open for both in-cab runs... maybe i should've run with it closed to compare inside noise... oh well.

what can i say? i'm thorough i'm probably gonna have to run cats just to be safe because i don't know where i'm gonna get stationed after training & whether or not it'll have to pass smog. it'd be nice to just run ORY or catless duals, but i don't wanna have to re-do it down the road just to renew my tags

2005 Silverado

iTrader: (19)

99% positive military personel on active duty can have their vehicle tagged in any state they want.

So do what you want they will mail you your tags.

My dads name is on my truck for this reason, I pay him, he sends me the tags, i keep "killing bird" with my catless exhaust.

_zebra

iTrader: (5)

hmmm...
i'm stopping by to see my recruiter today. i'll ask him about that.

budhayes3

iTrader: (19)

Ahh, I was thinking dual 3" for some reason...

_zebra

iTrader: (5)

nope. factory manifolds, factory catted Y, 3" mid pipe, chambered muffler - 3" in dual 2.5" out, previously no tail pipes - now dual 2.25" tail pipes to 3.5"x22" tips