How much hp do headers and cold air intake add??

Question

i have a 2000 mercury cougar, l4 2.0L., im going to add weapon r exahust headers and weapon r cold air intake, how much horsepower will i gain with both together??

Answer 1

maybe 20 at ur crank but u might gain about 7-10 at the wheels but thats better than nothin! but if u want to feel a difference turbo it! and plus gettin headers wont do u that good cause u still have ur stock catalinic converter! my advise get an intake ,headers, catback exhaust,underdrive pulleys(if they make them for ur car) and cut ur cat off and get a straight pipe with what they call a mills eliminator which is for ur 02 sensor so ur check engine light wont be on! might be hard to find someone to do it cause its illegal but if u dont get rid of ur stock cat dont even do anything with ur exhaust cause it wont be worth it

Answer 2

20hp total is my guess, and all at the top end, so you will notice nothing

Answer 3

Very little.  

Ignore the manufacturers claims.  I have yet to see an advertised HP gain that lived up to real-world testing.  For my own car for example the manufacturer advertises through its own competition parts department a CAI that is supposed to add something like 7hp and a header that is supposed to add 14hp. I read a dyno test of these parts together in a car magazine that measured the gains as only 4.4hp at the wheels IIRC.  Barely worth the cost unless your racing and every fraction of a percent counts.