I was looking to do a build with my 09 Cobalt LS with the LAP i4 in it. My list of performance upgrades include Longtube headers with a catless downpipe, a 2.4L intake manifold as well as a 2.4L throttle body, cold air intake, and all of this with a tune (because I do not believe these installed tuneless would be very effective). Any idea how much power this would bring me? My goal is to run 200hp without a turbo.

 

Youll probably need a ported head and cams to reach 200whp. A bump in compression ratio would help as well. Youre better off supercharging it and making more power for less money.

 

^easily this

 

I wouldn’t expect any more than 180ish whp tuned on regular fuel, but my intentions are to get a tune on 93. There is a guy I watched on YouTube who only did the long tube header, a catless downpipe, a cold air intake, and a tune on 91 octane ( ) and got to 180 hp with just that. Could I maybe get up to 200 that way? Btw, I understand a supercharger is the best bang for my buck, but for now I just want to make brute power

 

I mean get to 200hp with a tune on 93 instead of 87 like most people do

 

Zzp has a adapter plate to put a LSJ throttle body on the 2.4 the throttle body on the 2.2 and 2.4 are the same or very close about 64mm the lsj throttle body is almost 68mm also if e85 is around you then that would make a good difference.