Ok, so ive been thinking about investing in Hasports 4-2-1 header for the b16 swap in a late 80s to early 90s civic-crx. Ive searched in the archived posts but there was only two posts from the same guy that gave me some info. Now i know they fit up nicely and give a lot of ground clearance but what i want to know is how much power it gives you. No dyno results are out as of yet, so right now i guess im relying on your butt dyno to tell me how good this header is. Also, my friend just recently purchaced a header on ebay for around $150. Its a 4-1 header by some company that says its for a b16 swap in a civic-crx, much like hasport. Has anyone had any luck with this type of header? Another question: Which type of header is better 4-2-1 or 4-1? sorry for the long post

 

I can't give you any power figures or butt dyno estimations since I don't have the header but I can answer some of your other questions.

IMO a 150 header is ok but you get what you pay for.

A 4-1 header is good for mid-top end power

A 4-2-1 header has good low-mid range power.

A 4-1 header will compromise ground clearance while a 4-2-1 will have ample ground clearance.

 

you rock. thanks for answering a few of my questions.

 

i bought a header on ebay for an 99-00 civic si...only $79 and it worked awesome, i just took it to the local machine shop and payed $50 to have them drill and weld two bungs for the o2 sensors and it worked perfectly, seriously looked just like the hasport for about $300 cheaper.....just a thought