Just remove the return the spacer. Its not worth it.
As for how to tell if you are tuned, is your car an automatic? If so, try to rev it while in neutral...if it will go over 4,000 in neutral its tuned...just don't do it too much as revving that high in neutral often can be bad for the converter.
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2016 Camaro 1SS - 8-speed - NPP - Black bowties
2010 Camaro 1LT V6 (Sold. I will miss her!)
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