doubt this would be the problem but i could see it happen.
with the lower gears the RPMs climb much faster. maybe the stock cats start to restrict the engine trying to rise rpms that fast and cause a power loss.
but the stock cats could handle the stock gears because the rpms werent rising as fast and they could get the exhaust out more efficiently.
with the lower gears the RPMs climb much faster. maybe the stock cats start to restrict the engine trying to rise rpms that fast and cause a power loss.
but the stock cats could handle the stock gears because the rpms werent rising as fast and they could get the exhaust out more efficiently.