Updated June, 2009

AMS V8 Header Dyno Gains 

( 23.3HP & 25TQ Max Gains @ Rear Wheels) 



(Dark Grey Portion at top of chart indicates WOT was not yet acheived on both runs, 
therefore these numbers are not to be counted, ignore all data on the baseline run before 3800)

 

Independent Review & Dyno / Data Chart Comparison

My main goal was to get 40% to 60% of the power of long-tube headers for 20% to 30% of the price. After quite a bit of research, I decided to go with AMS short-tube headers. They are manufactured in thick stainless steel mandrel-bent TIG welded tubing as opposed to mild steel. Also the one-piece CNC machined flange ensures a spot on seal to the head. AMS provided all the hardware needed as well as the exhaust gaskets. The headers are ported and polished both inside and out which makes for nice engine jewelry. Because they were manufactured for strength and longevity, they are not much lighter than the stock units; which is a good thing...

Installation of the headers was performed by my independent mechanic. It took him about 3 to 4 hours to install. He had no issues installing the headers; they bolted up in the stock location directly to the head and to the primary cats...  

The initial reaction on start up and driving away from my mechanic was a glorious exhaust note. How could a set of short-tube headers make such a difference? It was not considerably louder, but rather a more enriched tone. I really was a nice surprise...

After driving the car around for a couple weeks to let the ECU adapt, I headed back for a post- install dyno run. Unfortunately it was a very hot day. Who knew it would be 90 degrees in Southern CA in the middle of January? In any event, the car put down 304.3 HP. I figure that the 22 degree difference was good for 2 to 4 HP, perhaps more. I'm figuring around 12 to 14 HP gain at the crank which lives up to AMS' claims and met my initial criteria. The change in torque was the most impressive result at around the 2,800 rpm mark; it is now difficult to hook up in 1st and 2nd gear with anything more than ½ throttle...

Overall, a great modification. Reasonable price, easy install, excellent fit and finish, excellent customer service, HP gains, and that glorious sound…

R171 SLK55 AMG (Thanks H.H.)

(gains were more conservative due to drastic weather differences between the before & after runs therefore the results were much more conservative than their true potential gains). 


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