Welcome to UKSC JAG. Your best bet for a TTE backbox is 2nd hand either from an owner on here or ebay, the advantage is that it will be a straight no hassle fit onto your starlet exhaust system, the disavantage is that they dont last awfully long and chances are the one you may get will be on its last legs. Still keep your eye open tho. Tailored backboxes are usually more expensive than universal ones which can be a nightmare to fit, possible but not perfect. Here is an example of an alternative (similar to tte) that will be straight fit. Lazer Backbox As for the tints, get them done properly mate ;) My two rear sides are done, but the rear was just too difficult due to the curve. Gonna get them done pro later. You have discovered yourself a nice project, feel free to ask anything on here , we are all happy to put you in the right direction, the rest is up to you Most of all, hope you enjoy the site. Joz