The header you have is 2inchs out then a 105 bend .the header you need that I'll give you on Saturday is a 105 bend as close to the motor as possible, all your issue will be over .
Yes it is the gas tunnel motor ,also same motor that tracy used for district championship in rigger . I got alot to test and rigger will be ready later this morning.
How do you seal the radio box ? And with how much that pinion has to spin to turn it's got to be slow in turning . My gas tunnel turns faster then my 21 .