1997 a4 1.8t 225k stock. Did some research on previous posts and found on 1 of the write ups someone liked bosch f6dtc, so thats what I bought. I just pulled old plugs and they were bosch f7ltcr. Do you see any problems switching or should I get those f7's in as soon as I can get some. I ran up to advanced auto and they said they couldn't get the f7's. Thanks

 

the 7's are a colder plug and the 6's are stock heat range. If you are at stock boost or just with a chip, they are better than what was in there