So I want to know how much time and money it cost to decarb rx8 and change two ******* spark plugs . 580$ is what some ******** charging me . I know for a fact sparks are 20$ each seafom is 10$ where the duck does he get 580

 

That's too much.
Search the forums, buy the parts and do the job yourself

 

4 spark plugs. But yeah I sounds like a ripoff.

 

That's a complete ripoff..
You can swap the plugs yourself its pretty simple.
Even Decarbing is simple.. instead of decardbing. take the car on a long drive, once its fully warm redline it in 2nd gear change to 3rd, redline it again. and upshift give it a break..

After a few minutes or so redline it again,

A few redlines on the freeway will help remove the carbon.

RIWWP posted a thread demonstrating using distilled water and Decarbing Seafoam they both barely made any difference.

 

Decarbing is a waste of time and replacing plugs takes 30 minutes tops even for a noob. If you are near San Antonio, Texas stop by and I will do it for $200.00.

 

A little over half an hour for me, and I'm a complete noob. Make sure you get a long enough extension on your rachet (at least 12") to reach behind the wheel if you're not going under the car. lots of good DIY threads on plugs. Good luck