Flowmaster Exhaust

Papa · #1 (**permalink**) 03-12-2003, 11:58 PM

First I'd like to say I hate when new people come onto a board and start asking questions without doing a search... so with that said.. I've been reading up the last day or so.

There is a lot of information in so many places so please forgive me If I'm asking stuff already posted...

After doing some reading I feel like for the price and perfomance gains/loss the Flowmasters are right up my ally.

What I'm having a problem with is what's the difference between the 40 series and 50 series.(for a 01 V8 SR5)

Do the Flowmasters come with rear dual exits or just rear dual side exits?(I'm not a big fan of the side exits.. prefer rear exits)

And finally... where do ya'll recommend purchasing this item? Should any local muffler shop be able to help me out?

Thanks for your time and please point me in the right direction if I'm in the wrong place.

delrmx01 · #2 (**permalink**) 03-13-2003, 03:51 PM

Quote:

Originally posted by hovisimo
the 40 series is louder and more offensive sounding than the 50 series. your muffler shop should be able to fabricate a nice custom system if they can't get the flowmaster system. stick with 2.25" stainless tubing.

Definitely keep the 2.25 piping to prevent anymore loss on low end torque. Set up I have is a 40 series 1 in dual outs, to side exits, one on each side--with a 3" tailpipe that's 12" long.

v8Toilet · #3 (**permalink**) 03-13-2003, 05:01 PM

Dual exhaust means you will loose your low-end torque just so you know that. I think this is well known on TS now!

Papa · #4 (**permalink**) 03-13-2003, 08:00 PM

Quote:

Originally posted by v8Toilet
Dual exhaust means you will loose your low-end torque just so you know that. I think this is well known on TS now!

hmmm... funny you should say that because one of the things I like about my truck is the low end torque. I've read from this board that many members lost the low end but then I read some haven't really noticed a difference..

Is it an extreme amount? Or does it depend on your set up?

It seems like a lot of TS members have a dual set up so I can't imagine it being a great amount of loss...??

BTW: Thank you everyone for your replies.

v8Toilet · #5 (**permalink**) 03-13-2003, 08:12 PM

My experience with the TRD dual exhaust has led me to believe that dual exhaust systems aren't good for low-end torque weather they are true duals or cat back systems. Before I put that exhaust on I could spin the tires from a stand still most of the time and definitely in a turn. After the install I couldn't spin them even in a turn at full throttle and the truck felt very sluggish off the line. I gave it two seeks and even reset the computer and the situation didn't improve. The i-force v8 is only 285 cubic inches and doubling the size of the stock pipe isn't going to improve power without other extensive engine modifications. Bigger isn’t always better!

I also e-mailed a TS member whom I won't say and asked him for dyno information about his true dual exhaust with an X-pipe and 2.25" pipes. This members Tundra put down 218.8 horsepower at 4200 RPM and 257-ft. lbs. of torque @ about the same rpm. A stock Tundra puts down 205-208 horsepower and 275-280-ft. lbs of torque to the rear wheels. He commented that it did loose low-end torque. He gained 10 peak horsepower but lost more than 20-ft. lbs. of torque.

Papa · #6 (**permalink**) 03-13-2003, 08:39 PM

Wow... and I don't I want to forfeit 20lbs of torque for 10 ponies.

So now, I ask... what should I do to get the deep throttle sound so many of us like without losing the low end?

v8Toilet · #7 (**permalink**) 03-13-2003, 08:43 PM

What I did here Installed a Spintech Sportsman muffler (review) . I will confirm my finding on March 29th but I strongly feel that my low-end and mid-range torque has increase significantly and it only cost me $118. I got the TRD filter used for nothing.

After I reset the computer and put in the TRD air filter that is when I noticed the increase.

Please read the whole thing!

Papa · #8 (**permalink**) 03-13-2003, 10:36 PM

Good reading... I'm interested in seeing the actual results. This sounds like what I'm looking for. Little to No low end torque loss and still a nice sound.

Tundra311 · #9 (**permalink**) 03-14-2003, 02:15 AM

I got true Dual Flowmasters. Let me tell you, sounds GREAT. Loud? YES. Power Loss? For me NO. Why i say no? This is why, I have raced other Tundras with SAME setups as I do and I still am able to beat them. I pull from them right off the line and I even pull from them when i get LATE STARTS (hint hint ABEL hint hint). Also I have an 03 which is suppost to be like 300lbs heavier or something then the 00-02's. So........what ever your happy, but i can tell you for sure you wont be happy with a 50 series.

Just for more info on what i have Dual Flowmasters Dummpped

Papa · #10 (**permalink**) 03-14-2003, 09:20 AM

Quote:

Originally posted by Tundra311
Power Loss? For me NO.

So you gained more horses... but are you experiencing the low end torque loss?

Also.. I've noticed this saying alot on this board..

True Dual.. what exactly is that?

Jack Burton · #11 (**permalink**) 03-14-2003, 11:17 AM

Hey Papa...

I just had the FM 40 (Delta Flow) 2.5" in and 2" dual outs installed. I had the muffler shop drop the exhaust pipes right after the axle pointing downward. As far as low end torque loss goes, I can easily spin the tires in a turn if I don't watch my throttle pressure. Before the install, I couldn't do that. I feel that the noise factor in the cab is as loud as I would go. I believe that FM 50 would be a better choice if you're concerned about that.
I had a custom "cat back" exhaust system installed for $300.00 + $20.00 tip to the installer. I am really happy w/it. JB

Papa · #12 (**permalink**) 03-14-2003, 04:50 PM

So Jack...

you purchased the exhaust and then had the shop do a custom cat back??

So that makes two who said they haven't lost low end...

I'm really lost now...LOL

Jack Burton · #13 (**permalink**) 03-14-2003, 05:36 PM

Papa,

I believe the cheapest price for the install would be to purchase the muffler yourself and then have the shop install it. Most shops I called stated that they would do the install for $40-$50.00 if I brought my own single in/single out muffler. (Non-catback.)
You can buy the FM 50 or whatever # you prefer @ JC Whitney for around $72.00 plus shipping if any......

I will check my mileage after 4 tanks and see if the muffler has helped w/my mpg.

What kind of driving will you be doing mostly...? I drive the freeway mostly and I can tell you that the truck flies at the mid to high rpms. I haven't dyno'd the truck yet. I'm waiting to install the S&S headers before I do, so I don't have any "computer" data to prove my gains if any......The "Butt-O-Meter" says that I have.

If you're still debating on what to do. Try finding members that have done an install that you're interested in and ask to drive their truck. JB

bradbury · #14 (**permalink**) 03-14-2003, 10:50 PM

I have a 2.25" true dual setup with 40 series original Flows. The originals are a bit louder than the Deltas...but the delta flows are supposed to help scavenging more.

I lost a little low end, which was compounded by the K & N intake. The JBA headers more than made up for it though. Adding an "H" pipe also helped, but made it a little less aggressive.

When this truck goes on down the road (in about a week), the next one will keep the stock air box, get a set of Flow 40's (with "H" or "X" pipe), and Downey headers. Judging by what I've gleaned from other TS members' experiences, and what I've done, this seems to be as close to the ideal setup as possible. That is, ideal if you need healthy V8 rumble on command.

stratbluz · #15 (**permalink**) 03-19-2003, 01:31 AM

My experiences with dual exhaust........

I have a true dual 2 1/4" exhaust setup with Vortex mufflers and the K&N FIPK intake. When I first had the exhaust installed, I was running just the K&N drop-in filter. The first thing I noticed (once I got over the awsome rumble of the Vortex's) was a very disappointing loss in low-end torque. This is a very real problem. I then added the FIPK setup which gained me even more on the top end (about 2800 rpm and up), and didn't seem to diminish the low end any further.

Question: Is 2 1/4" dual pipes too large. Would this small V8 be better served with 2" pipes to the mufflers to preserve low-end torque.......or am I way off base?

I'm having a custom cross-over installed this week........should help performance some, as well as help reduce the sound levels inside/outside of cab a bit. Don't get me wrong......I love the sound, but it does get a little annoying at certain frequencies.

BTW......had a Gibson cat-back before all this. Nice growl, easy install, cheap ($250), no noticable loss in torque, no noticable gain in HP. I simply wanted a little more rumble, and potential for more HP. (For Sale......cheap!)

Wish I'd become a member here a long time ago...........my wallet would be a little fatter and my brain would be huge!!