well it has extractors and a huge cam so you wouldnt need them, but still using a standard carb at the mo which is the restriction. but it really is the most responsive k series motor i have ever been in, and beats my mates 4k which has 20tho oversize piston (means jackall really) custom cam regrind but not as large as mine can tell by the note, slight port and polished head, extractors and again standard carbs. i always wanted to get this car down the HV to have a go just because of the suspension setup the car has. just wish it had some more power behind it so i could really have a go