I think with the lip you could do a legal bumper swap, for the factory 08 CR bumper, the new rules allow swapping of factory bumpers, plus addition or deletion of spoilers and front lips. So technically you should be able to just drill the stock bumper, the CR's bumper just adds the holes for the splitter. Bumper swaps are allowed, but not a update/backdate trunk swap for the CR wing. Again, intent is to allow, but is very unclear how to execute legally.

If I bought a CR, which I tried, I would have deleted the rear wing and front splitter (I personally don't like the looks of those parts, and prefer the clean lines of the base S2000) To eliminate the wing, I would have had to fill the holes on the trunk lid and repaint it to be legal,versus swapping it out for a base trunk that was already the correct color (black, white or yellow).

 

I think a whole CR front bumper cover would be allowed... it is a bumper cover that is standard on a US model of the S2000. Bumper covers are allowed if they are EITHER: 1) a standard or optional part on a US model of the vehicle, OR 2) in the accessory catalog. #1 is satisfied.

 

Yes, assuming you're putting on a WHOLE CR bumper / Lip on... then I believe your right. Who knows.. maybe the structural impact foam is different...

 

Jeff C., when will we see your S in STR trim? Giving up on the MX5?

 

The S in STR trim will be a few months, no rush, I will still be running the MX5 for a while, until I sell it anyways. I am not giving up on the MX5, she is very fast and extremely competitive, it is more of a time to move on for me, get back into something with more power

I am picking up the Hondata Flashpro today, and I have the Berk cat coming. Next will be the header, I think I will be getting the PLM. I probably won't be doing suspension until after I sell the MX5.

So, if anyone wants a really fast STR MX5, let me know, she will be for sale.

 

Has anyone done any testing to see if it increases the manifold pressure? I can see issues with two air paths colliding and causing more turbulence than air that is draw smoothly into the chamber.
If you examine the successful intake designs such as the Mugen then you can see it has a single path with smooth flow to the intake element with a larger path than stock. It wouldn't surprise me that Honda designed the size of the opening and the built in duct in the top cover to supply enough air for a stock motor. In 2006 you will see a redesigned channel built into the upper part of the air box. On a dyno, just changing the lid on a 2005 to a 2006 lid makes a noticeable difference.

 

I'd be pretty surprised if there is much concern of air flow pattern pre-filter. Post filter, through the rubber tube going to the throttle body, is the real bottle neck piont, and likely the main area of concern for laminar flow. I can't believe any modifications to the box would have an effect on this, since all flow patterns will be "reset" as it passes through the filter material. Anything before the filter (engine bay side) is likely not flow limited, and I would suspect the main goal being cooler air, not smooth flow.

 

If that were the case the mugen intake wouldn't perform that much better than stock.

 

I didn't think it did... I've never seen conclusive dyno numbers on a mugen intake. It has a much bigger filter than stock though doesn't it? Never really examined one up close.

 

Do these routing of intake air mods really make a difference beyond the noise (measurement precision) of a dyno? I just view it as doing the best that can be done kinda like taking off a pound of weight here and there that eventually adds up to make some difference.

Here's the latest on my placebo air intake mod which does take off some weight at the same time. Note that now the passenger side chamber is cut off as well. I will be looking at alternate places to route the hose and that is why it is not cut off yet. I forgot to weight the airbox before modifying, anyone know the stock weight? I'll weigh this once it is completed, still have to finish some dremel trimming and close up the lid duct path.