Funny how u and I always understand each other.

I don't care for awe exhaust , I don't care for Markski exhaust. I don't care for my straight pipes to be honest either !

Some people just need to keep finding excuses and blame test results on people conducting the test.

Fact that 911tuning exhaust had crappy 75$ cats can be seen from picture Markski put up and a simple google search. It just goes to show that all these guys who yell quality - don't know where to look for. Worst part about it is they get offended when someone points it out. I guess I wouldn't be happy either if I bought a $3-4k exhaust and it used cheapy cats. Don't kill the messenger

 

I was going to stay out of this thread, but after reading some of the mis-information contained here, I just have to comment...With all due respect, your assumption of the performance of a 2.5" vs. 3" exhaust is not accurate or correct information - at least with respect to our SpeedTech X-cellerator X-Flow systems. We dynoed our shop car with K24/18G's and FULL supporting mods (SpeedTech Hi-Flow intake plenum w/hard piping, 2.5 IC's, 2.5x75mm Y-Pipe, 75mm TB, 75MM IPD plenum, dual fuel pumps, injectors, etc.), with our 2.5" vs. 3" exhausts back to back and found a 25HP difference in a very small 1500 RPM window in the mid range - that's it. When real time driving at WOT, this small blip goes by so fast (a fraction of a second), it is not perceptable to the operator of the vehicle. I have switched back and forth between 2.5 and 3.0 several times and can not feel any difference between the two at this level. Additionally, I have done 1/4 mile runs with multiple exhaust systems. Our former twin can 70mm system (non-X) and our current 2.5 & 3.0 X-cellerator X-Flow systems. The results in real world testing are all the same...my car runs best times of 11.0x to 11.1x, trapping well into the 130's with all systems. So in real world, road testing, at the roughly 700 HP level, our 2.5" system is absolutely fine in terms of performance and leaves nothing on the table. Additionally, it is virtually drone free and makes ownership of the car much more enjoyable than some of the high HP designed systems being discussed. Obviously, I can use any system on my car because I manufacture them and I choose a 2.5 because I am completely satisfied with the performance and love the sound attributes. To say you need a 3" exhaust at roughly 700HP, IMO, is just plain wrong and I have tested enough to feel comfortable saying that....As for cats, I can not speak for the cats mentioned in this thread, as I am not familiar with them, but we manufacture our own cats from scratch, beginning with a substrate manufactured in the USA. We cut our own turbo flanges, then port and flow match them to the K-Series turbos (approx. 3.2") for maximum flow and no restriction out of the turbo. I have been running the same 100 cell cats for years at this power level without failure. I also have 130,000 miles logged on this car and over 60 1/4 mile passes. 70,000 of the miles with K24/18G turbos and full supporting mods, so I have a fair amount of experience on which to draw my conclusions...again, IMO, to state a 2.5" system is not adequate for a 600-700 HP car is just plain wrong and a 60 WHP difference between a 2.5 and a 3.0 system at this level is not a "reasonable" assumption, either...at least for our products.

 

What about a prochamber design rather than an X or joined U bends?

http://www.moddedmustangs.com/forums...ml#post3850990

 

I really don't understand why no one ever mentions or looks at Protomotive criss cross set up? I know it makes excellent power on his big HP builds.
I am not pushing it, I run and am happy with my Milltek but always interested in more power with out alot more noise.

 

This looks like a good ole vendor fight. The blog article from AMS clearly just tries to make an unfair point/comparison of the 911tuning exhaust and then gives no details as to the AWE exhaust they are comparing it to.

Not to mention this thread's main purpose is to display that biased blog article under the pretense of trying to show some data that the X is not a flowing as straight pipes (which is already known and common sense). No empirical data was given as to a before and after backpressure as well which lends to my theory.

Plus Mark and Tim have a grudge against Markski and try to discredit him and his products every chance they get. I have point blank asked Tim what his grievance is with Markski and he did not reply.

What have we learned in this post - NOTHING. What has this post done - tried tried to discredit 911tuning's products. Hmmm Seems like the rouse has been discovered! Plus AMS removed comments from their blog as they are trying to cover up their blog post purpose as well.

This all is just so shady I have no words for these people and AMS. Makes me sick how some people spend so much time and energy trying to ruin someone for no good reason.

 

U r right my link was to a 3" version, one in your picture is even a cheaper 2.5" version. Mark in the picture you posted it's visible that your cats are of very low quality and are extremely cheap. You mis represent that to your customers saying you use high quality parts and imported cats ( i guess china counts as imported) and the only junk being spread here is the 50$ cats you sell in your 3000$ exhausts, u put the picture up not me !

I apologize for comparing your 45$ cat to a larger and more expensive 75$ model.

 

i am no vendor i actually don't like AWE much. i do feel AMS is a respectable tuner.
what a foolish statement.

i have no grudge against Markski. i just call it how i see it and thats not for everyone.


see above comment

nothing shady about it. just a pair of imported cats

 

LOL,, Hmm....And I can not even compare facts about different tunes that I had without getting jumped on? LMAO.

 

I have a more important question...what song it's that on the white 997 video

 

So a 2.75'' would be perfect then...

 

So, back to the facts..

Backpressure after the turbo = bad.

Oh, and less backpressure(after the turbo) does not kill tq on a turbo car but, a mismatched turbo, poor timing and a/f ratios does...

next thread please..

 

You jest but bring up a good point, are we talking outside diameter here or are we including the effects of the 1/2" inner diameter worth of louvers inside some of these mufflers? Some 3" exhausts really aren't... I'd take a 2.75 perforated core over a 3" louvered for flow any day.

 

Mark yes your correct but If I sat here all day long and looked at every single word in a post half of these posts would be deleted or cleaned up. Some even from you.

But regardless of that fact. On thing that has only be mentioned 1 time on here is how a Vender sells a part. Buyer gets what he ordered. Takes it to a shop has it installed what ever the reason is it failed. Not knowing everything about the issue yet. Seller refunds in Full the buyer. I can tell you from my own experience if every vender would do that I would have a 8 second car again maybe not a Porsche but something. And for AMS not to publicly say in there HARD FACT BLOG that the supplier if that part that they feel has failed "has Refunded the buyer in Full" is a shame. All out shame.

I think we are all missing the point. Whether it would be EPL. Protomotive. Vivid. Anyone at all I would say the exact same thing. EXACT. sorry guys but Mark is in business to make money. But got his lumps for what ever reason and took it like a honest supplier and came good on it. This forum has been lately for bashing suppliers even when they do nothing wrong.

 

you spelled whether wrong!

 

LOL yes your correct! Rep points for you