Hey I tried browsing and i was unsuccesful in finding out any good spots in an 03 TL-S for tweeters.....If I was still 18 I'd bolt em right to the A-Pillars and be done with it.....but I'm 22 now.....time for grown and sexy haha

 

I just installed component speakers in my TL last week. I'll post pics when i get home so you can see where i mounted the tweeters.

 

Hope this will b someting u guys will like ..

 

check out my setup. This is on a 99 TL though so i don't know if yours is different
https://acurazine.com/forums/car-talk-5/considering-getting-one-these-opinions-159742/