I had a chance to do a direct swap test on a customers car recently that I thought some of you may be interested in. This car was custom tuned on the dyno with:

AMS Intake
AMS Boost pill
AMS UICP
AMS FMIC
Ichira Test Pipe
HKS Cat-back exhaust

A couple months later he came back with everything being the same except for an entirely new exhaust system from AMS wich consisted of:

AMS Widemouth Downpipe
AMS Test pipe
AMS Twin Tip Cat-back Exhaust system

With all the other variables being equal, even the boost level you can see the dramatic gains here:



Over-all I was impressed with the results and the excellent improvement in response time once we had it fully tuned out. I felt this was a very good example of how the correct parts combination can make a huge difference!

EDIT: As it says in post #18 The car had a test pipe on it for the 'before' dyno plot.

 

Great job, but I still dont understand why anyone would run that exhaust considering its only a 2.75" dia pipe throughout.

 

thanks Chris you did an awsome job on the car here is a vid of the last run.. Chris can you also say what a stock evo x gsr dynos at?

 

i love the the look of it,and is pretty quiet

 

Looks good! Between the test pipe and widemouth DP, looks like it gained about 200-250 rpm of spool and 30whp.

 

better gains than extenze, nice!
Chris nice work as usual.

 

Those gains are great, but it's not really apples to apples. He was utilizing a stock cat prior to that so its natural the car will gain an easy 15whp. But, i'm sure the widemouth had something to do with it as well which is why i'm saving up for one.

 

test pipe alone is good for 10-15 whp. i do not think this is a valid test.

 

My thoughts exactly....

 

Eh? What the hell are you guys talking about 'not valid'?

'Full Exhaust' implies turbo back. Therefore, the widemouth downpipe, the test pipe, and the cat back exhaust. The previous setup was the stock exhaust elbow/downpipe, stock cat, and the HKS exhaust.

All the information is there. Chris did not leave anything out. It's not like he said, "we switched from the HKS exhaust to our exhaust and gained 30whp!"

Quicker spool, more power at the same boost level, more power everywhere, and the difference is significant.

 

Yeah I supposed they could have swapped in the stock cat back and likely gotten 40 whp but they listed exactly what they had before and after, Nice work!

 

Both the HKS and the AMS have about a 2.9" inner diameter, which is pretty standard for a 3" exhaust (implies wall thickness in the 0.05" range).

 

Completely stock GSR's dyno around 245 on this dyno.

 

Hey Chris,

Glad to see gains with the AMS Products. I do have one question. Do the AMS Products work best with AMS Products ONLY? The reason I ask is because of your results and what I have seen on my Evo X MR. My first mod was an HKS Drop-In Filter with a tune and made 309AWHP/292AWTQ. Then I added the following: AMS Intake, AMS FMIC, AMS 3" Test Pipe, AMS UICP, MXP 3" Down Pipe, Buschur Racing 3" Cross Flow CBE and retuned to make a 9WHP gain totaling 318AWHP/303AWTQ. Any ideas or suggestions? Thanks in advance for the information.

 

The comparision here is between Turbo back vs Cat back, impressive but not surprising if you ask me.