Should be average 284.9ft-lbs right

 

Yep, good catch. Looks like MM&FF made a typo and I just copied it right along. I edited my original post to show 284.9.

Thanks

 

Well it looks like the SLP then gives you a slight power decrease since unmuffled loses power.

 

With HP varying by only about 3, I think it's all about which one you think sounds the best.

 

That appears to be the consensus, sound difference.

Sam

 

I think FRPP is Borla Stingers, Ford just rebadges them. Very disappointing considering some of the claims out there. Stock mufflers made more peak HP than no mufflers? Flowmaster beat Magnaflow. Never would have guessed. I'm cannot wait for part II.

 

I did not recieve my copy yet, I'm guessing this is not a stock car? I kinda figured the loudmouths would be lower, but with all the talk of the "chambered mufflers loosing power, and for the flows to come in over the magnaflows, glad someone finally tested. I finally decided to go with the bassanis when my car gets here, but since they all are within a few ponies go with the sound you like, Can't wait to see what they get out of the xpipes.

 

I'm kinda new to this stuff and admittedly have alot to learn but rather than looking at the relatively minor gains in peak HP from some systems doesn't the larger loss in average HP from all the systems bother anyone? I was kinda of surprised to see the declines in average vs. the increase in peak. Thoughts?

 

I would take higher average over higher peak HP, so I would probably get so chrome tips from MRT and call it a day. I still need to read article, but based on what I'm reading, A lot of these companies lied big time. Magnaflow gurantees their products make power over stock. It sounds like they need to put more money into R & D and less into adding new members to Team Mangaflow.

 

After reading the article, I think I'm going to go with the flowmasters. Since the power difference is so small, and I love the way flowmasters sound, sounds like a winner.

 

anybody notice that the JBA mufflers lost torque and power across the board? :notnice:

 

I wonder if they posted power & torque curves. If the peak is level or close to stock, but you see an exhaust flow gain down low and through-out the RPM range, you would see a performance improvment. What I have read in several magazines is that Ford really did their homework with the Mustang exhaust system, and unless you really get into headers, X-pipe and seroius mods, there might not be too much to gain, other than a few dB with a muffler swap.

 

I have to point out that their muffler weights are full of bull. Stock weighs more than 16 lbs, and the weight difference between stock and Bassani is only 2.5 lbs each.

2-4 HP means nothing. Their runs could not have been identical unless they where in a climate controlled room, and the engine was at the exact same temp for each run.

 

Good point. What's the margin for error on a dyno, 1 percent? I've seen back to back pulls vary 2 or 3 HP.

 

I wonder why they did not test the Corsa. They claim 13 HP I think.

 

And Al Gore claimed to invent the internet, too...

Anyone who thinks they will get any measurable HP from axle-backs is dreaming, IMO.

 

Exactly, go with what sounds/looks good. my 2 cents

 

Hum, well after adding a C&L CAI and SCT2 tune, I'm well pleased with my stock muffler/exhaust system.

As for bang for the buck, the only thing I might consider down the road now is adding a X-pipe since reading all this information.

Any suggestions for which X-pipe to purchase?

These axle back and cat back systems can hit the wallet pretty hard - now I'm seriously questioning the value of these mods - which I had been considering.

 

The value of an axleback to me is just a better sound. I spent $340 on the SLP PowerFlos, and I love them.

 

MM & FF will do x-pipes next month. I'd check out the mag first.