Afew heads/intake questions

Well lately I have been looking for explorer heads and possibly a intake to produce some cheap hp gains. I found that there are the GT40 and GT40P heads, can anyone tell me what the differance is?

Afew more questions: As intakes go what is the best for the cheapest? I have been looking at those typhoon's, explorer's, and trick flow street heat. Anyone have any experience with any of these and could help me decide?

And last but not least, are the cobra heads also GT40 heads?

Thanks again guys for all the help :hail2:
 
For all practical purposes, there is not a significant difference between the GT40 and GT40P heads - but I'd use P heads if all else was equal. Yes, Cobra heads are GT40 heads. Any of those intakes will work - buy the cheapest one you find.