Fender exit headers

What is the story on all the headers I am seeing that exit through the fender? What is the benefit?

room available

room, downforce

Various reasons.Noise,fumes,sheet metal rattle,sound better,and SOMETIMES easier access to engine AND oil pan. The guy that built Harold's is gonna build me a set.

Easier routing for down pipes on turbo cars.

Jess

So you can shoot blue flames on the hose at night.

My car is so freakin' low, there was nowhere else to put 'em. Side note: I no longer need to stuff my ears with cotton inside a full face helmet. Noise in the cockpit is at least cut in half. Floor is cooler, too.

I was guessing easier to tune and a power gain from fewer bends. Figured the noise would still be there since its right in front of the side window.

Are you using merge collectors with these or straights?

I stepped mine, 2 1/8" to 2 1'4", then to a merge collector. Downside on my deal, the primaries are too short. Yes, it shoots flames w/o a bottle. The interior noise deal is much improved because the collectors point AWAY from the car. Can't speak for the folks standing at the fence, tho.

I built a set for my car last year and love them. Car is quiter, no alky fumes and the underside of the car is cleaner.

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I think they sound a lot better.

Race Ready Fabrications wrote:I built a set for my car last year and love them. Car is quiter, no alky fumes and the underside of the car is cleaner.

this^^ x10! the floor in my car was cracked in a few places so the m5 fumes realy sucked!

bbf-falcon wrote:...............
I think they sound a lot better.

i dont like mine at idle,sounds like a open manifold

Ok, I'm convinced. I know when I went to upright headers on the puller, it was much quieter in the cab. Looks like I'll have to plan to build a set of these. I am thinking of doing a set of stepped headers as well. What merge collectors are the most popular?