Two questions to the owners of a Magnaflow:

1)Does installing it void any type of warranty?
2)Have you had any problems so far with your Magnaflow?

Thanks

 

1) NO!

2) NO!

 

i gave the part number to the muffler. people this is ALL you need. keep your stock piping, buy this muffler and a 4" tip and youll notice some good power when you hit it!

 

Anyone have any pics of a Magnaflow installed on their truck?

 

I was browsing the Magnaflow website and I noticed a blurb about just replacing your Muffler might not be the most effective if you have pipes that restrict the flow before the Muffler.

It sounds like SVTErick has some pretty strong feeling about just going with the Muffler, can you expand on why you went this route and why you feel the Flowmaster cat-back system isn't worth it??

 

anything over bigger than your stock piping is a ticket to losing your low end, though you will gain top end. with stock piping and my muffler and tip i get stainless steel tubing a great muffler and tip and keep my low end and top end. a flowmaster muffler is as good as a gutted stock muffler.

 

How'd you decide which one of their hundreds of muffler to go with besides the obvious size requirements?

How does your muffler compare to the 14246 another poster went with?

 

i went with it through a buddy of mine on FTW's suggestion. he tried the muffler before and told me to try it, so i did and to tell you the truth ive gone Gibson, Flowmaster and Dynomax and this Magnaflow muffler has the best sound and performance of them all. remember in terms of performance, i went SI/SO so DI/DO is going to cost you a little low end. it aint really that big of a deal. good luck!

 

It's tough to have a definative discussion about this without an understanding of the valve timing in this engine. SVTErick is probably right though. High torque engines typically have less valve overlap making them more efficient and powerful at low RPM's. Decreasing back pressure (with a cat back) has the same effect as increasing overlap, which does make the engine more powerful at high RPM's (which negate the effect of increased overlap) at the cost of low end power. Because of this, I wouldn't install a full cat-back system until I could put an intake on as well. Increasing the velocity of the intake charge will compensate for the decreased backpressure by increasing compression and the ratio of intake to exhaust gasses in the cylinder. That said, I'm going to wait until all the intake companies have their designs nailed down. Then upgrade the intake and exhaust at the same time.

 

good point Scru. the gain is so minimal that its really up to you, what you do. i would definately add some sort of aftermarket air intake though.

 

What kind of difference would there be in fuel economy and performance in just replacing the muffler vs. cat-back? And does it justify the price difference?

 

the price is $400 for the catback VS. $200 for the muffler, tip replacement.