duo- you are correct that in fact that tune up parts are cheaper at TVH then NAPA- but the their quality ***. I can't tell you how many times I've had to replace tune up parts from TVH because customer went to the dealer, bought what he thought were manufacturers parts ( & paid manufacturer prices) only to find out that they were aftermarket junk.

I almost never have a problem with the parts from NAPA & when I do- they replace them- no questions asked- no RA forms to fill out, no lost credit, etc.