[KRAM36]

Originally Posted by jsceash

No I don't live in a dream world. If you have some documented data on your HP gain post it so we can see.

Here is what I've done in five years of tracking a my car starting with the original 2.7 motor. I can say for some time I've run almost every configuration of air intake on track and have hours of data recording to back them up.

In the 2.7 with an smooth 3-1/4" inlet pipe upgrade plenum and 74mm throttle body stock MAF stock air box desnorkled. My recorded improvement is 19-20 HP

The next year I ran a Agency power box with a cone filter a SLIGHT improvement.

The next year I had the 987 box stock MAF. The rest was the same as above. I had "NO" improvement in HP or Torque. But I wasted an entire weekend getting it installed IHAVE NO PROBLEM SAYING IT WAS JERRY RIGGED. I could only get 2 bolts in it was cockeyed high in the front low in the back and towards the motor in the rear.

Using your prices the straight pipe throttle body and plenum would have been $170 without 4-6hours removing the intake injectors and all the other crap.

This is a fact I can say the 987 air box never was installed right until I removed the 2.7 motor to install the 3.2/3.6 conversion. It's flush to the cover now the flange had vibrated against the top spot Brad had previously mentioned and made a flat spot that was nearly through. It was bad enough I bought another one.

This may be the case on your setup with a 2.7L engine. I've read the stock ECU tune can only compensate up to a 20% increase in air flow. I've also read that the ECU can not correctly read the air volume when using the 987 MAF house without a tune. Sounds like when you put the 987 air box with the 987 MAF house you exceeded the 20% air flow, which would yield the car running lean and with the 987 MAF house a tune was needed. I'm surprised your HP numbers didn't go down.

It's also a known fact that Porsche put the smaller air box on the 986 to keep it's performance down. They cut the nuts off the 986 with that air box.

Originally Posted by Brad Roberts

It's tough online to see me smiling when I post "tongue in cheek" comments Thanks for not getting offended. It was meant in jest.

Yes, it went away and the engine air inlet temp went WAY down. Down to what we expected to see based on a stock CaymanS. GM has a division dedicated to inlet air temp on the Corvettes. After meeting a person who works in that group, and what I have seen on professionally raced Boxster's and Cayman's... I take air inlet very serious (to the point of covering the entire intake/air box/piping in the gold foil to keep the temps down. Heat kills!!!

Porsche cut the nuts off the Boxster's and Caymans. The trend for larger throttle bodies and larger headers is well founded, but you have to match it with a larger air box. So far the CaymanS airbox has proven to be *good* up to 420hp. I have not tested past that (GrandAm M97 engine in a CaymanS)