[Zoesequoia]

I'm wanting to do a dual exhaust setup on my 06 ls coupe. Had the thought of making 2 separate manifolds. On for cylinders 1/3 and one for cylinders 2/4. Both going to their own side exit exhaust with 1.5" tubing. Basically wanting to create an oscillating exhaust sound.

The main question is would the 1.5" tubing be a decent diameter to keep the exhaust flowing or should I go to a 1.25".

And with each exhaust attached to cylinders 1/3 and 2/4 would the actually work do you think? Or would 1/2 and 3/4 be better?

Or is this just an impossible mission all together? Any thoughts would be most appreciated!

 

[MP81]

I'm not sure I'd bother - the collector containing all four cylinders will be more beneficial than only two.

 

[Zoesequoia]

I'm not sure I'd bother - the collector containing all four cylinders will be more beneficial than only two.

Makes sense. How would a y pipe after the down pipe do? Wouldn't get the oscillating effect but could still do a side exit on both sides?

 

[1966tbird]

Check the exhaust on a current Malibu Premier 2.0L turbo. They have a single exhaust from the turbo to a Y pipe near the rear and twin exhaust tips. A standard little 250hp eotech 2.0L engine that could just drop into a Cobalt.

 

[Zoesequoia]

Oh alright, right on. I'll have to look into that for sure

 

[MP81]

I mean, if you just want dual outlets, SLP made one (not sure if they still do), but as far as performance gains from any kind of "true dual" exhaust on an I4, there aren't any. More than likely it would be detrimental to performance.

 

[Zoesequoia]

For the slp you mentioned. Is that a dual tip or something like a y pipe? And if I reduce the diameter to 1.5" would that help balance it out or just make things worse? I guess the question is would I lose performance due to there being 2 pipes and it being to open but could fix it by restricting the exhaust piping. Or would it be from the y pipe or junction used to split it with no way to gain some performance back.

Let me know if that makes any sense.

 

[Cliffter]

I'm wanting to do a dual exhaust setup on my 06 ls coupe. Had the thought of making 2 separate manifolds. On for cylinders 1/3 and one for cylinders 2/4. Both going to their own side exit exhaust with 1.5" tubing. Basically wanting to create an oscillating exhaust sound.

The main question is would the 1.5" tubing be a decent diameter to keep the exhaust flowing or should I go to a 1.25".

And with each exhaust attached to cylinders 1/3 and 2/4 would the actually work do you think? Or would 1/2 and 3/4 be better?

Or is this just an impossible mission all together? Any thoughts would be most appreciated!

I think the former is better.