hey guys i was just wondering i was thinking of getting the blox header and blox test pipe and there both 2.50 and i right now i have a dc sport header and stock cat which are 2.25.Well my apexi bolt up to the blox test pipe?

 

2.36".... I know cause i have that shitty thing in my basement

 

so im guessing it wont fit. i just wanna the header but i dont know if the stock cat will fit.

 

it'll bolt up doing worry. I have a JDM 4-1 itr header and a 2.5" test pipe bolted onto a ITR catback for daily use, so yours should work to.

 

mines a gsr car arent they just 2.25 and the itr cat is a 2.5? I think imma go ahead and get the blox header first.

 

nope, gsr/ls are 2" i believe and ITR's are 2.25".

 

If you're asking if it'll bolt up, it should. It'll just cause a bottle nose effect into your 2.25" apexi ws2 b pipe piping. I'm currently running the rmf narrow copy header (2.5") and a hollowed out jdm itr cat (2.5") which is connected to my apexi ws2 catback system as well. Of course if I wanted the most power out of my mods, I'd get a 2.5" exhaust system BUT living in CA, I don't want to draw any more attention.

 

i have an apexi on my teg and it does fit

 

2.36 is the ID, this exhaust and all of the other exhausts that are marketed as 60mm are (or can be considered depending on wall thickness) 2.5 inch exhausts, as metal tubing is measured by OD and wall size. So, with standard exhaust tubing being 16 gauge (.065) 2.5-(.065x2)=2.37, which when converted into milimeters is 60mm which when converted back is roughly 2.36. The K-teller and SMSP exhaust tubing kits that are marketed as 2.5(OD) inch have an ID of 2.37 like the majority of the aftermarket exhausts on the market.

 

well today i bought the blox header which are 2.5 and the inlinefour.com flange and gasket where its 2.5in/2.25 out which would bolt up to my cat which is a 2.25 is this alright too?

 

is the setup i bought alright?

 

Yup!

 

thanks lots guys

 

But, you need a better exhaust haha. I dont like apexi

 

okay i got my blox header today and noticed its way longer then my dc sport... and it passes my cat were the header and the cat bolts up. Can anyone tell me whats wrong do i need a test pipe?

 

Oh, so you got the HYtech replica, yeah then it's correct that it goes past the cat. You will probably have to cut the Tri flange off the exhaust and weld on a flange that will fit the header. But if theres a gap between the header flange and exhaust flange, you could make a tiny adapter like thing to make it fit.

 

i have a 99 gsr is there any other way to use this header without cutting or welding. I dont wanna mess up my cat back system like just buying an catback that is an 2.5 and will direct fit the header?

 

well okay i was reading on jhpusa they have a blox test pipe witch well adjust to any length to fit any header? Well this work for this header and whats the up and downs of using a test pipe.

 

Does your catback go past the header mounted?

 

the blox the length is the exact as my dc header and cat together which is better long.

 

well i think its almost that long

 

Pictures is worth a 1000 words get a pic that will help ha

 

yeah i dont know about a test pipe i think a testpipe would solve this problem. Never used one can yall tell me the good and bad of using a testpipe?

 

Get an after market 2.5 CAT, the weld on the correct flanges, and make it the right size.

 

probably gonna end up selling it or trade it for a mint itr header.so anyone with an itr header holla at me haha.