[racerg35335]

From what I understand it tricks your tmap sensor into thinking it is at a higher elevation thus requiring more boost to achive the same load. So yea... basically it just raises the boost. For the record I loved my jb+. It really is more than a "modest" boost in power. On most platforms you would spend thousands getting the same boost in power as a $120 (used) jb+ can give you. Will you want more... probably.. will it satify you for the time being and if you are not looking for 400whp.. I say yes.. will it put a big smile on your face... defi Honestly I think I is quicker (at 75%) than cobb stg 1 drive and comparable to stg 1 aggressive. (I am running cobb now with a custom e30 map and have experience with both). Let me know if you are looking for one. Mine has been sitting in my glove compartment for 6mnths. Lol.