Can vouch for the products from Steve at JNT. Have used there stuff for years on various projects. Below is a pic of the rams Ernie put together for the chassis dyno session when I made the switch to e85 fuel. They were much longer at the start of the day and Ernie shortened them up after each power run till we were happy with the power and torgue curves. These long tubes made better mid RPM power with a reduction of peak power and the short tubes made more peak power [~6HP]