QUOTE(SLITS @ Mar 20 2012, 05:13 AM)
If you keep it original you get a choked down version regardless. Exhaust on the '75 - '76 robs horsepower. Backdating to an earlier exhaust gives a little more spirit when digging in the spurs (especially if it's a 2.0L).
In CA, the '76 has minimal value due to smog laws ... if they change the law, then all the current rules are off. I don't know what the smog laws are in Okiehoma or any other state for that matter.
Just don't do anything that you can't put back to original, & definitely SAVE all of your original parts when you backdate exhaust, etc.
Another option if your engine is still the original numbers matching one the it came from the factory with, would be to source another 2.0 motor to build a hot 2056 or 2270 etc. & "cold store" the original motor. If the motor has already been swapped & not original, then upbuilding it won't make much difference.
Call PCNA & order a Certificate of Authenticity (COA) for it to confirm if it's the original motor, transaxle, factory options, etc. They'll ask you to take a pic of the GC engine number & email it to them to confirm it's a 2.0 for the COA (if they don't ask you, do it anyway to save a step in getting them to correct an erroneous COA.
Their COA may need corrections anyway -
at their cost & free to you BTW, cuz they're notorious for misreading the older option codes on vintage Porsches! It took me 3 times for them to get it right!!
Look up for your local OKC 914 folks on here, cuz they were trying to do informal get togethers alternating in OKC & Tulsey Town every month or so.
Y'all ...