Whats a good car gift for my Dad? it is a 97 Miata ?

I've got a old Dad who's turning 53 in about a month, and I wanted to purchase him a gift for his car, a 1997 Mazda Miata 1st gen, and he used to drive a fastback Ford Fairlane and some number of other muscle cars. Now he's older and convinced himself to get a cheap Mazda Miata. He onestly loves how the car drives and handles. nevertheless what do you guys think could be a good gift for his car. now he's headers, catback exhust, roll'bars, front lip, spoiler, and short shifter. I remember him mentioning that he could like some unlit rear lights, still I could not find any. I am not super rich because I am still in school, so I thinked about purchasing him something around the range of $40 $70. Could you guys think of anything?

If I did not answer enough in my description just post me back and I will edit the answer or just email me. Thanks.

Dude,

you may be able to get the unlit Miata rear lights on Ebay for under $70 before shipping and some number of sights have reasonable shipping. I'm sure he could love them. I included a link to make it easier for you.
motors.search.ebay.com/tail lights_Car Truck Parts_W0QQcatrefZC6QQcoactionZcompareQQcoentrypageZsearchQQcopagenumZ1QQfgtpZQQfmmdZMiataQQfmmkZMazdaQQfposZQ5AIPQ2fPostalQQfromZR2QQfsooZ2QQfsopZ2QQftrtZ1QQftrvZ1QQfyhiZ97QQfyloZ90QQlopgZQQmppfqyZtailQ20lightsQQsabfmtsZ1QQsacatZ6030QQsadisZ200QQsaobfmtsZinsifQQsaprchiZQQsaprcloZQQsargnZQ2d1QQsaslcZ2QQsbrftogZ1QQsofocusZmppfmotors.search.ebay.com/tail lights_Car Truck Parts_W0QQcatrefZC6QQcoactionZcompareQQcoentrypageZsearchQQcopagenumZ1QQfgtpZQQfmmdZMiataQQfmmkZMazdaQQfposZQ5AIPQ2fPostalQQfromZR2QQfsooZ2QQfsopZ2QQftrtZ1QQftrvZ1QQfyhiZ97QQfyloZ90QQlopgZQQmppfqyZtailQ20lightsQQsabfmtsZ1QQsacatZ6030QQsadisZ200QQsaobfmtsZinsifQQsaprchiZQQsaprcloZQQsargnZQ2d1QQsaslcZ2QQsbrftogZ1QQsofocusZmppf">motors.search.ebay.com/tail light.

id do a cold air intake to out that exhaust, plus it'll give it a more agressive sound and more power, other than that id say lowering springs

Why not get a high quality model of one of his last classics?