I no this header thing is getting over kill but I havent heard anybody talk about this. Basically when running open header with say a JDM ITR 4-1 header vs. header-tech header vs. smsp header Does the header-tech or the smsp still make alot more hp over the jdm itr. I no a full exhaust is a different story but when ran open head. Do the better headers still make a big difference? And were not talking side exit header's just street headers. Thanks

 

it will still make a big difference.

if it didnt, then all race cars would just get jdm 4-1 and run it open header.

U still need to spend good money to get a high output header if you are running open header

 

I NO

it's " I KNOW "

 

you know you should know how to spell know you know