i have an 08dxa w/INDY PIPE (black ceramic from jet-hot)/SERT/K&N FILTER. i haven't started it for apprx. 6 weeks, so i decided to run it for at least 20-30min., had it running for apprx. 10 min. then reved it up a little, fluctuating from idle to 5500rpm's. well, i noticed the rear header pipe glowing bright red. the front was not as bright but it did go away quickly as i let it idle. my question is...is this normal? i don't remember any of my bikes doing this. please advise, thanx.