Gentlemen;
Mr. Butler is NOT running an inline six in his NASCAR vehicle and we all wish him good luck at the races.
When "hopping up" one of these low horsepower engines, everything MUST work in unison.
These bogus pipes (alone or together) prevent that because; they re-direct the exhast flow from what the headers were designed for.
Muffler Shops sell them to CYA misleading the customer, so they won't have to do a job over (FREE) should the customer get a "noise ticket".
You can't confuse what some do on the race track with what we do here, It's a different world.
Happy trails.
