The blacktop has lighter internals which might be also weaker, but it is a bit faster. No damage if you're not accomplishing any significant mods, but any forced induction and you'll be needing to uprate the blacktops internals. You will find as many tuning theories as there are tuning outlets. https://jdm-toyota-2jz-gte-vvti-f35665.webdesign96.com/27221011/the-basic-principles-of-toyota-4age-for-sale