FOSTER21

Ive got a 99 z28 and the flowmaster thats on it is pure junk! So im looking for opinions

BOBS99SS

iTrader: (2)

I started a thread about mufflex and there 4 inch system,but its a recent thread some good clips on there,yes flowmaster is junk unless its one chambers on duals

Driving FaSSt

I have the mufflex 4 inch single catback with Longtubes and ORY... It sounds good.. I get nothing but compliments.. It does have a have a high pitched tone at WOT.. My friend has LTs and ORX and bullets dumped on a true dual setup and at any given RPM my car is just as loud

hitmanws6

iTrader: (20)

They are good systems with the exception of the single in/dual out Spintech mufflers. Guys routinely gain 20hp and 2 tenths at the track by putting a cutout before the muffler

davidws6

iTrader: (36)

I posted in Bobs99s thread .

I have the 4" Mufflex with a straight through Magnaflow.

Lil more mellow then the video of the Spintech muffler, except when I stomp on it.

I'll get some drive time on a video when I return from OZ on the 26th.

LS1W66

I have the 3.5" single out system with a Flowmaster 30 series. I always get compliments on the sound, It's louder at idle then the previous 3" system and really comes alive at WOT.
System install is pretty straight forward, mine required a little pipe cutting and fab work on some of the mounts to keep rattles away.

KRAZY K 2000 TA

iTrader: (5)

i have tried slp loudmouth,flowmaster,Hooker Junk Fit,And the Mufflex spintech is by far the best!!

skimms98

iTrader: (7)

4" Mufflex single here with the Spintech muffler. Still stock cats and y pipe but LT's are coming soon. I love it, no drone and the car feels way snappier vs the Flowmaster that was on it when i bought the car. I had the 3.5 version on my old 98 Z28 and it picked up a solid 2 tenths and 3 mph at the track over the stock catback!

Paul Bell

iTrader: (9)

I had the 4 inch system on my '94 Formula installed by them in the Mufflex shop. Worst install ever. It hit everything. The floorboards. The driveshaft. The rear U-joint. I was happy to chop it out. It droned pretty badly on the highway with the Spintech muffler.

I wouldn't do more than a 3.5 inch single and I would stay far away from Mufflex.

brian_rs/ss

i have a 4" spintech system, i have vids in my sig. and with a very conservative set up i made 396 rwhp. adding a cut out might bring me 5 or so rwhp, but i really don't see picking up 20.


dyno sheet. the two curves are before heads and after heads.(untouched 799's)










before heads
http://www.youtube.com/watch?v=i3jwE7tjed4

before heads
http://www.youtube.com/watch?v=6SSuCJUCn3I

http://www.youtube.com/watch?v=vT7xBllQMe4

after heads in car.
http://www.youtube.com/watch?v=8sl0eZOgPng

current set up:
799 heads
ls6 intake
slp lid
prof products 85mm tb
30lb SVO injectors
TSP 224r cam(224/224, .581/.581) 114lsa
comp magnum 5/16 x 7.400 pushrods
patriot gold dual valve springs
mufflex 4" cat back with 3.5" stainless tails
TSP o/r y-pipe with flowmaster 4" merge
pacesetter ceramic coated LT's
melling high volume oil pump
n-motion LS2 single roller timing set

Paul Bell

iTrader: (9)

Brian, your installation looks very good. Sadly, mine was anything but. I wish I could say my experiences with Mufflex were better.
　
These pictures are the system as they installed it. They wedged a rubber block in the pipe over the rear to prevent tapping on the floorboards. The hideous front flange also hit the floor. Their hangers were bent wires poked into the body hangers, welded to the piping then cut off. The muffler hung so low, a floor jack wouldn't fit but there was enough space above the muffler for a loaf of bread.
　
The pipe over the rear kept hitting the rear. The pipe also hit the universal joint.
　
At one point the entire rear of the system pulled off the hangers and hung to the ground.
　
Their lack of craftsmanship, quality and concern for the customer getting what he paid for was very disappointing.

You guys all see I have ample reasons to tell everybody about the fun I had with Mufflex.

brian_rs/ss

uhhhh, i had zero problems with my system. i did have to have my muffler shop custom weld some stuff, but that had to do more with the y-pipe than the cat back. i have a tsp y-pipe with a fm merge spliced in. it took very little modification to get it to work. and i have zero tapping/banging or clearance issues. the only banging i get is from not having poly motor mounts(which is my fault). sorry to hear about your experience and it comes as a surprise to me honestly.

n20kid

iTrader: (6)

Brian + Mufflex =















LOL! Brian's car sounds really nice, Had to do it Bud

brian_rs/ss

daaaamn...thanks bobby.



hows the camaro coming along?

KRAZY K 2000 TA

iTrader: (5)

mine looked as clean as that first install too! and it didnt hit anything rattle squeak nothing bad i did scuff mine and paint it all though.

Marc 85Z28

iTrader: (8)

I had the 4" single in/dual out Spintech. Hated it. Sounded awful on a healthy 355 SBC. It was HEAVY, and looked like **** from the back. The muffler was just a HUGE box that hung way too low. I traded someone online the rear section for a single in/out Flowmaster. Perfect fit, dropped a ton of weight, picked up MPH at the track, and the sound is fantastic. Both systems required a lot of finesse with the install to clear everything.

Paul Bell

iTrader: (9)

When I have the money, I'm gonna go with the Stainless Works 3.5 inch system.