HomeMadeTurbo fans, check out the products for homemade engine management tunes at DIYAutoTune.com! DIYAutoTune.com is the largest seller of the MegaSquirt engine management system. Our newest model is the MSPNP Gen 2 plug and play engine management setup, where we have versions that plug into over 20 different cars (with more being added on a regular basis) that plug right in where your stock ECU goes, and let you tune in real time with a laptop.