I understand that you can change the internal spring to make the gate open and close at different psi's. But what is the real difference in the different MM of the wastegate? What are the positives and negatives to going with a bigger wastegate such as a 46mm? My situation in particular Im doing a 20g swap and have found a good deal on a recirculated o2 housing with an external wastegate like such
Im not getting the ebay one for the record. But it does have the 4bolt hole design, and it looks like this design only comes in 46mm? At least thats all iv seen. So would this set up be ok for my 20g setup? but more importantly what is the difference between wastegate MM sizes?