Not sure if these questions have been asked before, so here it goes:

Has anyone noticed any significant difference in performance between the turbo and standard heads?

The '08 models come with turbo heads, so I was wondering if I should invest in a standard head also.

And regarding glowplugs....here in Houston, the outside ambient temperatures have been hovering around mid to upper 90's (Fahrenheit) and will only get hotter. According to our local news weathermen, after factoring the high humidity (90+ percent), the heat index(not sure how they came up with this, but you'll see/hear it during the local news) is approx. 102F-105F. Would you still recommend using a P3 or P6? Keep in mind, I'm running Byron's 2nd Gen 30%.

Thanks.