since I am about to pick up an 88 4runner, I am a bit worried about performance, and gas mileage.
has anyone used or switched to the above products, and what if any changes did you notice? especially if you have use a Tornado.

 

Ummmm ... no.

None of those will make a significant difference. Do a tuneup, keep your tires inflated, and drive smart and you'll get the best possible gas mileage.

 

out of those listed only thing i would use is the true flow