Are there any stores in your area that have a dyno and do tuning? Is there more than one shop?? Just take a couple of days and take a look at the store, inquire to look at them though they tune. The Silvertop is just like all past A-series engines https://blacktop-4age-for-sale52400.shotblogs.com/the-best-side-of-toyota-4age-engine-for-sale-46164628