Exhaust Review by mach1review
 

http://www.mach1review.com/CATBackEx...emsReview.html

even though they said magnaflow won, it was only by 4 rwhp difference against slp. slp made more tq than magnaflow or bassani. hey, not bad for a straight resonator design that was supposed to make you loose tq :), and cheaper than magnaflow,

loudmouth should be the winner here, best price, better average power, best sound. what else do you want :)

what do you guys think???

also, i'm installing an mrt h pipe next week, i was going to buy the jlt cai, but after seen all the little issues, i decided to play safe and get a mid pipe. i went with a catted h because of the sound. i would receive the pipe on july 6 (thanks yellowshaker) :CHEERS:

what do you guys think my car would gain with an mrt h pipe.????
loudmouth already installed :THUMBSUP:

I got my Magnaflow shipped to my door for $330. What did the SLP cost? The best sound is subjective. I had Magnapacks on my 01 GT and thought they were too loud. I've heard the SLP's on a dyno and they are obnoxiously loud. But, you can't go wrong with anyone of the catbacks reviewed.

did you notice the "what else do you want :)"
you can't go wrong with any catback at all, is just a matter of opinions. i said that as a joke, but is up to you to take it or no ;)

Awesome!! I have always been a believer in Magnaflow and I have always recommended the regular system to anyone who asks my opinion. Great review! I wish more companies would have stepped-up and submitted their systems for the review, but still a nice job. Confirms my bias! :THUMBSUP:

i wish the borla crew would have allowed for the testing of their cat back.

:agree: The borla is one of the systems Iam considering. Glad to see the others were close, Its probably going to come down to looks and sound for me.

The results point out exactly what my results concluded. Compared to stock with just the cat back mod, you will lose HP and TQ below 4K. You will gain HP and TQ over 4K. If can make up for the low end loss, then it is the thing to do because the top end gains are nice.

I think you missed what they were saying. It was the combination of CAI and cat-back that made it so lean and robbed the low end power. Seems like a dyno tune of some sort is in order with both of those mods.

Oh I got that. I just wanted to point out they also mentioned the cat back alone would cause a lower rpm loss. That was my point, but I guess I did not state it well. Sorry about that.

My A/F was pretty much 12.5 after 2300 rpm and hit a low of 11.9 at one point before holding at 12.5. Since this does not indicate a lean condition, I have to attribute the loss solely to the cat back flow design since it did not lean out the engine. I guess only the combo would do that, or would a CAI alone do that?

My question to you and everyone is: What is the best way to get the low end power back w/o going back to the stock cat back? I am new to EFI and computer controlled engines, so I need some suggestions.

Thanks

An intake spacer from PHP did it for me.

I was considering that (just as another mod), but did not want to do it until I heard the results. Thanks.

In August I am going with the MRT h-pipe and mag cat back not magpacks and there will be no losses only good sounds and good gains :HOPPY:

So, are you saying the MRT h-pipe will offset the losses from the cat backs alone because even the "Flows" will have low end loss just like the "Packs" do. How will the MRT h-pipe prevent the low end loss?

Huh...?
 

Dude, an H-pipe w/o cats, are you kidding? That alone will give you 15-20 hp...Isn't that more than enough to offset any low-end loss from the catback....?

Matter of Opinion
 

I really like the sound of the Magnaflows, as well as the power gains. I also had to take in to consideration the noise level (need to keep it quiet). I even went so far as to purchase and install the Bassani baffles in the tips (helps just a little bit). For the power, looks, noise level, and price it seemed like the best buy for me.

Robert

Re: Huh...?
 

Right, but I would not go catless. :D Unless I have missed something, cats are still required in Oklahoma.

I guess the MRT H-pipe referred to 40MACH1 are catless, right? If that is correct, I understand what you are talking about now.

I have the Magnaflow X/cats and Magnaflow catback. It's not overly loud at cruising RPM's, the 2 were designed by Magnaflow to work together, and I noticed no low RPM power loss. But my tune is good.


While I appreciate tach9 and crew's hard work testing the catbacks, I don't think it proved much by adding different catbacks to a car with CAI and not tuning for each. It did prove, to me anyway, that all the catbacks are similar in the power they make, and your decision should be based on factors other than reported power gains or losses. I believe Tach9 has said the same thing.

Ralph,

Thanks for the info.

Can you explain what you mean by "but my tune is good"? How do you know it is good. That may be the area I need to look into.

Again, thanks.

My A/F are in the 12.5 to 13-1 WOT range all the way.

I think you guys are making way to much over any potential low RPM power loss from bigger pipes. Even if it's there, and on my car I don't think it is, it's not very diffucult to be in the power range when necessary.

I also don't think there is anything wrong with just adding aftermarket H or X of choice, and weld in some straight thru muffs. I think you make about same HP a little quieter....and maybe a little lower in RPM curve.

You can't feel 10 HP on the street one way or another, and 5-10 HP doesn't make a performance difference on the street either. No matter what the butt o meter says.

lol on the butt o meter part. :CHEERS:

I don't disagree with you either. After 2200rmp my A/F was a flat 12.5 with one short dip to 11.9 so I think the tune is probably ok. Would like to see a flat 13.0, but that might be difficult to get.

I understand about getting into the power band. I went up against a C5 on the expressway and found out in a hurry about what gear to downshift to at 70mph with the new cat back. Going to 4th was a joke. The C5 showed me his tailend. Going to 3rd at 70mph got me above 4K and I could stay with the C5 and even pulled him a bit.

On the dyno we tested the shift level. Shifting at 6K the rpms stayed at or above 4400rmp so we were in the power band. I will learn to live there if I can not get back the lower end rpm. I may just go to the MRT cated H-pipe. ;)

this is a retarded review........ were are the chamber type mufflers, i.e flowmaster, mac flowpath. Arent the borla and magnaflow the same "straght thru" type muffler.

If you'd be so kind as to provide those systems, the M1R would gladly review them....as it was, those MFG's wished not to participate...don't blame the review, we're just a messenger :ANGEL:

Just wanted to say I found the reveiw interesting, even though not everybody wanted to send an exhaust to you. I would have liked to see the Borla Stinger but it appears that there isn't much difference between exhausts power-wise. Thanks