hondaapi

As the topic sais.
When do you regard a complete 4" exhaust systemas a must.
I had a discussion with a friend about the pipe size in high HP applications (700+).
We had different oppinions.
I thought a 4"DP leading to 3"exhaust system would be enough.
His oppinion was a complete complete 4"system.
But this would be a hard work to get it under a civic (especially in the swaybar area).

Do you think there is a good benefit from such a complete 4"system?

Thanks

seen4ever

i don't see a point to have a 4in dp and then run it through a 3in exhaust. i think most people that are hardcore enough to actually need a 4in exhaust, don't run full exhausts. they run the 4in dp past the front axle and put a downturn on it.

for me, i'm staying with my 3in exhaust. if i can't get more power out of it,then i'll go open dp.

quik sol

4 inch downpipe into 3 inch exhaust? thats a waste...it would run just like a full 3 inch setup....4 inch is unjustifiable IMO, it just isnt needed, and like stated above...if it is....then they need to just do a side exit dp

hondaapi

Ok. I often heared about the open DP setups.
But here in Germany it is definetly forbidden to run open DP.
Also at 1/4mile races - it sometimes happens that you are not allowed to start..
So we are searching for a good alternative.

mrDFWmechanic

only cars that need exhaust that big would be a supra