I'm doing a b16 swap into my car & have the opportunity to buy some new dc 4-1 headers for $150. i've got three questions....

1) would the 4-1 design be good for a b16, or would a 4-2-1 be better? my understanding is the 4-1 is better for high end horsepower, but the 4-2-1 is better for low end torque, which the b16 is lacking.

2) there's only one o2 sensor bung in the headers. where should i have the secondary o2 sensor put in? will a reputable muffler shop be able to do this, and how much should i expect to pay?

3) i'm planning on building a crv bottom end over the course of the next year. will these headers have enough clearance for the b20 block?

thanks,
Eric

 

1) 4-1 is good for high end... which the b16a has a lot of. 4-2-1 is better for low end which the b16 lacks... Id go 4-2-1.

2) a muffler shop should be able to do this for around 30 bucks

3) Yes it will fit the b20