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Discussion Starter · #1 ·
Wuz up!!
I need to know what is better for my (99 si) a 4-1 or 4-2-1 header. A lot of people tell me the 4-1 is much better. I need to know where I can get these headers cheap online or in the Miami area. Also where I could get and intake manifold cheap, that is less than $250 for each, or somewhere around there. Also I just took my catalitic converted off my car and put a straight pipe there. Do I get more hp from doing this? Is it better? I have a catback but just took my cat. coverter this weekend and I feel the car with less restriction. Is this better or worst for the engine?

Thanks for your replies
 

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personally i think you the 4-2-1 one piece will give you more all a round power and more low rpm torque which the si needs. the removal of the cat does allow you to generate more hp but you can't pass smog obviously.
 
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