How much horsepower does the Flowmaster lose to Magnaflow, Borla and the other Catback systems?

 

A good bit. The better your set-up, the more it will hurt.

 

Everyone bad mouths the flowmaster but I love it! My opinion is that it sounds the best and it gave me good power check out my sig.

 

Where?? My 01 SS dynoed 306.3hp 327.9ft tq BONE Stock with a paper filter but im glad you like the sound of it


Anyway, IMHO Flowmaster is 100% pure garbage.. They are the performance exhaust co. but all these years still not a stainless exhaust.

 

I did better than that stock. flomaster sounds ok, but there are a lot better systems out there if you are spending the money.

 

just to give you an idea, i ran my car stock with flowmaster catback and did 13.6@105.... put on a loudmouth and ran 13.5@106. but, as was said before...the more mods you do to your car, the more the flowmaster will hurt you

 

had slowmaster and ran 13.4. went with hooker and ran 13.1

 

I had the flowmaster and liked the sound, but switched to GMMG .

 

i have a flow master and i ran a 13 sec. run with all my mods except the Lt's i will see what i can run this summer with the Lt's i think i just know how to drive lol I also love the sound of it and its even more aggressive with my kooks on now. Although i do plan on getting a new exhaust because as stated its not stainless and mine is rusting. i will be getting something stainless for shure.

 

considering the highest flowing catback exhausts (well...shy of the 4" mufflex) will only gain you about 15hp at best on a bolt on car....the flowmster will probably yield about 1/2 that.

now if you're talking on a 450hp car...the difference increases

 

man flowmaster gets ragged on so hard on this site..lol. does anybody have actual dyno charts of the flowmaster robbing power?

 

Ok well thats fine but lets see here my time slip says 13.1 at 107.8 on the factory tire with just a lid and flowmaster catback on the stock goodyear 245's. So I guess if I had a slp cat back I what of been in the 12's right. Give me a break. My car didnt get slower when I put it on. I went from stock 13.8 at 104.5 TO 13.1 at 107.8 with "JUST" a lid and flowmaster. And I doubt that the lid made up 7 tenths of a second on its own. I dont feel like argueing with anyone here but I think you should by a cat back for the sound not the power gains. There all gonna get you 8-10 rwhp anyway.

 

I have a flowmaster, but I also have a cutout that stays open...I'm not worried about hp loss. But TD's should go on pretty quick.

 

About 3-5HP ...not more than that according to surveys...there is a survey that has been posted a few times, and its 5hp less than the best I think...as far as CROSS-FLOW mufflers go.

 

I put a flowmaster on my 02 and it would not even turn a tire. The same day I put stock back on it. Called Flowmaster and out of the horses mouth that the 80 series is for lb9 l98 and lt1 the muffler wil not gain power on a ls1 he did not say it would lose just said it had no increases.

 

i love my flowmaster with lts and ory it sounds great,but i have a cutout that i open at the track

 

My buddy with LT's, a Flowmaster 80, and cutouts saw no difference with cutouts open or closed at the track in back to back runs.

 

I'm gettin flowmaster cuz i like the way it sounds and i get pulled over too much with the SLP. I'm gonna have a cut out for when i go to the track.

 

I like mine also---have a QTEC for power and more noooiiiissse. I like my c/o open about 1/2 way ...sounds better..open all the way sounds lousy below 3500rpms IMO.