will i lose torque with I/H/E?
 

i heard that without the backpressure, a NA 4 cylinder car will lose out on torque
has anyone experienced this?

RE: will i lose torque with I/H/E?
 

I have. Its noticeable, but I think the slight increase in hp is worth it. Either way, torque and hp have their own benefits.

RE: will i lose torque with I/H/E?
 

No you shouldn't loose torque just due to more effecient air/exhuast flow.... if that theory were correct then I could partially block my exhaust pipe and get more torque? The only thing about headers is if you notice there is 4-2-1 or 4-1 setups and one style is better for mid range and actually increases torque and one helps out on the top end a little better....

RE: will i lose torque with I/H/E?
 

well, im talking about low end torque
even in the game Gran Turismo 3, when you get an exhaust system that is too freeflowing on a small 4 cylinder engine, you will lose out on bottom end torque, but you will gain more horsepower

RE: will i lose torque with I/H/E?
 

which header is better suited for low end torque? 4-2-1 or 4-1?
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RE: will i lose torque with I/H/E?
 

In many cases 4-1 headers are designed for racing applications where the vehicle is being driven at or near redline. The 4-1 design maximizes top end power, whereas the 4-2-1 evenly distributes it throughout the power band. There are cases where a 4-1 header works better than a 4-2-1 and creates more power in the mid or higher RPM ranges, but a 4-2-1 header will undoubtedly boost the horsepower of your car.


anyone here with a 2.5 inch catback exhaust pipe?
i think that a 2.5 inch should be good for a 4 cylinder, right?
its not too big, but it also allows the gases to pass through well

RE: will i lose torque with I/H/E?
 

I got the 2.5 inch catback. If it's working well for me without restricting my engine, then it should work well for just about any street legal application

RE: will i lose torque with I/H/E?
 

In most cases you want to go with an exhaust thats 2.25 max for a N/A car. One with a turbo you'll need 2.5 and bigger.

RE: will i lose torque with I/H/E?
 

the catback that im planning to get is from megan racing and its 2.5 piping, but its for NA cars
i guess its good?

RE: will i lose torque with I/H/E?
 

I would say 2.5 is really maxing it out. Im sure its fine, but I like my 2.25.