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View Full Version : 4.3 pipe size limitations


Koots
03-19-2007, 11:40 PM
If i were to replace my 4.3L stock exhaust (just had some snowmobiling kids cut me off in which i smacked into an icy snowbank-and my exhaust took all the shock) with 3" single pipe. would i be losing power or is this the way to go? any response within the next day would be awesome cuz it's going into the muffler shop, by than.
no2guncntrl
03-20-2007, 01:32 AM
I run a 3" pipe from the cat back to the end of the tailpipe.
I'm sure it's affected low end some, but my truck is so slow
it doesn't matter...:cheer:
FryZ71
03-20-2007, 06:15 AM
I had a single 3" from the cat back w/ a FM40 dumped under the bed on my old '98 4.3 ZR2 w/ no probs., sounded good too.
Koots
03-26-2007, 03:59 PM
What size exhaust is standard on the 4.3? im thinkin 2.25 maybe 2.5 but i cant get a straight answer and it's a little too wet outside to crawl around on the ground with a ruler, so any help would be super appreciated
f4tal
03-26-2007, 04:09 PM
stock exhaust size is 2.5 i believe im pretty dang sure it is. i would jsut run the stock exhaust size just a diff muffler and sum headers or sumthin
Koots
03-26-2007, 04:15 PM
Finally an answer! thats what i thought, but you guys have much more experience with modding these suckers. im a FSC newb, but not to vehicles in general.
SierraStepside
03-26-2007, 04:17 PM
my truck, a 99 Sierra 4.3L. Stock pipe is 2.25 I just put a FM 40 seires with 2.5 out with it turned down before the axle. I think 3" might be a little big. I wouldn't go above 2.5
Koots
03-26-2007, 04:26 PM
im gonna have to ask you for a sound or video clip, cuz that is exactly what i was wanting to get. wanted to see how the 40's would sound on a V6.
SierraStepside
03-26-2007, 04:37 PM
I'll get one up by this weekend. I am very pleased with it. Sounds pretty deep, and i just replaced stock muffler with it and had it come to a turn down. $170 bucks for everything
f4tal
03-26-2007, 08:19 PM
i have a flowmaster 50 series muffler and my truck sounds like a v8 at idle till about 3000 rpm. any V6 though will sound like a V6 at higher rpm's there is no way to change that. lol. i have side exit pipes right b4 my back right tire. it sounds good. i will try to get a sound clip of it soon. the only reason i didnt get a 40 series muffler is because everyone i know of has a 40 series flowmaster muffler and i hate havin tha same chit as everyone else