I remember emailing someone on the forum about an idle issue and he had a problem with his DOOLZ/JWT chip setup. Apparently the JWT dual intake takes in double the amount of air while the DOOLZ is 1.8 or something in that area. I don't have the email anymore so I can't put you intouch with him but I'd email Ash and ask if he's run into any problems.
1989 240SX Fastback. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1995 300ZX Twin Turbo Warning: Objects in mirror aren't as fast as they thought they were.