Bosch Plugs Deciphering?

[Michael Spiers <mikes@specnet.com>]

It's tune-up time here in Washington, D.C., so I set about to do my tasks last
night.  Did my shopping over the weekend, picked up a set of Bosch Super's.  I
wuz checkin' the gap on my new plugs & comparing them to what the owners manual
suggested, and noticed that I'd bought W7DC's, and the owners manual recommends
W7DTC.  What's the "T" stand for?  Do I need to yank 'em back out and go pick
up a diff'rent set?  Car runs fine with 'em in there, so they'll stay unless
someone can tell me why they should come out!!  Also, how cum Audi doesn't
recommend a resistor plug for the TQ's?  TIA!

-- 
-Mike
mikes@specnet.com
mks107@psuvm.psu.edu
87 5000CS TQ
84 5000S (2,000 miles away and a mile high)
90 80 (sibling's mode of transportation I get lynched into working on)