Good Day

I took my Indy Spring out for a drive last summer and 2 miles from the house the CHP pulled me over. He said "you don't have a front license plate", your car's illegal. I asked him "what about the five cars you passed, including the 2013 BWM without a plate to get to me? He didn't answer.
Told him to give me the ticket, but fair ought to be fair.

He then went on to say the car was illegal because it didn't have turn signals. I told him they didn't have turn signals in 1929. He then said I didn't headlights, so I showed him the lights. He said you don't have a horn, so I honked the horn. He looked at the registration and said "it's a kit car, it's not legal". (The car started off life as a 1929 roaster pickup.) Had to tell him it wasn't a "kit" car, it originally had a Michigan title and came into CA in 2003 (it was first registered in 1929 in Detroit).

Make a long story short he finally said well, it's a cool car and the weather is great, have a nice ride! All he really wanted was to get look at the car. The car IS street legal with plates, etc.

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What's the power plant?