my car stuff is in the sig. i am deciding which cam / head / pcm to go with and would like some input on tpis.com. they say when they port the stock head it flows better than the afr. how important is it to have the head / cam / pcm all match?? they want 550 for the pcm. i thought fast chip and pcmforless did a great job for way less cost. should i go with a different set up? any help would be great. thanks.

carl