2.5 vs 3inch catback

[svtfever]

is there a power diff between 2.5 and 3in for a na car with headers, tune and intake. I don't ever plan to go FI. also is there a sound difference

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[2015 Silver GT]

No power difference.

 

[Derek@Lethal]

There will be no difference on mildly modded NA cars. I would choose based on what's more readily available or if you have plans to stay mild or get aggressive down the road.

 

[1320']

You've got to be pushing serious, serious air to really make use of a 3" exhaust..it'll be louder basically.

The 2.5" kits, like the FRPP Touring or Sport will support all the flow you need and will cut 30lbs out of the car. The stock exhaust is good for well over 500WHP.

 

[GSLSE20B]

The crimped rh cat pipe removal will be more helpful than a bolt on CATBACK

 

[Ultrakla$$ic]

Bigger is better.........ask any woman

 

[Higgs Boson]

You "can" make 1000 HP with 2.5 inch exhaust, but that doesn't mean that it "supports" 1000 HP.... 2.5 is good up to 425-450 before it begins to restrict more HP (airflow). How much an exhaust supports is not based on how much you can make with it, it's based on at what point it stops freeing up more power. The stock exhaust is good for up to 500 rwhp but what happens at 500? Does the exhaust fall off? no, but at 450 rwhp I bet there will start to be some gains by going up in size, more gains the more power you make.....then it becomes a value proposition and more grey area.

 

[GDP]

You "can" make 1000 HP with 2.5 inch exhaust, but that doesn't mean that it "supports" 1000 HP.... 2.5 is good up to 425-450 before it begins to restrict more HP (airflow). How much an exhaust supports is not based on how much you can make with it, it's based on at what point it stops freeing up more power. The stock exhaust is good for up to 500 rwhp but what happens at 500? Does the exhaust fall off? no, but at 450 rwhp I bet there will start to be some gains by going up in size, more gains the more power you make.....then it becomes a value proposition and more grey area.

This might sound like a tarded question but is this to the crank or the wheels?

 

[svtfever]

how big is stock exhaust? 2in?

 

[Higgs Boson]

how big is stock exhaust? 2in?

mostly 2.5 but I think there is a point or two where it necks down to 2 or 2.25 at a connection.

if you are going to replace it, I would not use 2.5, I would go to 3 just for some headroom

 

[svtfever]

major bolt ons are done. this car will stay NA

 

[Higgs Boson]

This might sound like a tarded question but is this to the crank or the wheels?

crank, but you can see there is a lot of wiggle room....

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