hey guys.

i've been trolling the forums lately trying to find an answer to my question, thinking someone must have had this problem before, but to no avail. here goes.

when i bought my truck (79 f100, 302), it had no exhaust system, save a y-pipe and a single cat. the first day i got the truck, i got out the hacksaw and lost the old clogged cat. it was loud, very loud with the y-pipe dumping right under the seats. i wouldn't have minded, but the sound was full-spectrum (i didn't like the high-frequencies) and it hurt my ears after several minutes of driving. so i decided to get a full dual exhaust system put on.

got a couple of flowmaster 40s off ebay and went down to the muffler shop. i had a full system installed: an x-pipe after the manifolds into the two flows (about a foot in front of the axle), then over the axle and straight out the back. btw, it's all 2.25 pipe. problem is, the system is too damn quiet. i can barely hear anything from the cab.

compared to my car, it sounds like a wimp. my car is an 89 grand prix with the 3.1, stock 2.25 single pipe and a 40 right under the bumper and it has a nice rasp, with a good roar coming into the passenger compartment.

my question is how do i get my truck to be the same? should i dump the exhausts right after the mufflers? should i stay with the pipes straight out and get big tips? i'm at a loss. (if it means anything, i have noticed that the exhaust coming from my car seems to have a higher velocity).

also, will the sound change once i get headers and a free-er flowing intake?

 

Headers will change the sound a good bit. I have flow master on my 89 burb with a 3inch in and out and a single 3 inch tail pipe. It is quiet inside the way I like itbut has a nice deep note outside when you are into it a bit.

 

move the mufflers as far up as you can, and dumping it at the rear isnt helping for hearing it inside i would try infront of the wheels and then if that aint loud enough under the cab.

 

Get headers, mount the mufflers to the headers, then pipe it back near the diff and dump it. If it still ain't loud enought get Purple Hornies header mount glasspacks.

 

thanks for the responses, but the question still remains: will hacking up my new exhaust system give the sound i'm looking for? i'm thinking about cutting off the portion that routes over the axle and putting dumps right after the flows (just in front of the axle).

 

Did you check to see if the flowmasters were delta flow? Delta flow flowmasters make it very very quiet inside the cab, but can still be heard from the outside. Also, are your tail pipes coming straight out of the back or are they angled behind the rear tire?

 

not sure if they're deltas or not. the mufflers i bought were original flows si/so, but the guy at the muffler shop switched em for si/co. they are flows, and i measured the cases to make sure they were 40s, which they are. so they could be deltas. but as i mentioned above, the v8 sounds a little too tame (inside and out) and, for lack of a better word, muffled, compared to the sound coming from my car. (my car has nothing but a tip welded onto its 40). i like the raw, raspy sound i get from my car, and was hoping to get a magnified version of that from my truck.

 

any help here, guys? just want some advice on the sound like before i hack up a $200 exhaust system.

 

before you say it is quiet, get a friend to drive it like he stole it while you are standing behind it. and then have him drive by as you stand on the side of the road. 40 series flo's are LOUD!! the reason you do not hear it in the cab is because all the noise is going out the back of the truck. a buddy has a dodge hemi quad cab with the 40 series dual exhaust. inside the cab, you can not hear it even with the windows open. he was complaining about it the same way you are till i jumped in it and took off with him chasing me, and ducking the rocks from the spinning tires. when i turned around and came back for the drive by, he was grinnin like a little school girl looking at a chipendale dancer. . that was 4 months ago, and since i parked it he has not said a word about it being "quiet". in fact, he has gotten 2 noise tickets.

 

tjc is right on my wood hauler i installed duals running straight out the back. from inside you dont hear them but from behind WOW. try running turn outs to the sides that way you are only cutting the very ends of your new exhaust