Quote:

My 383 70 was an LA build. Normal thru the valance tipped exhaust




Only certain motor combinations mandated turn downs for cars sold in California in 1970 and 1971. No matter which plant they were built in.

For instance 70 Hemi E-bodies, built in Hamtramk of course, that were sold in California had turn downs as part of thier Noise Reduction package.

I believe for some cars/years the Noise Reduction package was more than just tips?