MrGreek

which RB combo is better for your buck so to say.
I realize that the header/presilencer would essentially be better, but more money than the down pipe/presilencer combo. but which has the better bang for you buck?

LittleCon

RB actualy recomends the downpipe / prescilencer combo (because theres really no difference between that and the header combo)

ErixHvn

Depends on what you got. NA or turbo? one doesn't work on the other. Downpipe would be for turbo only. NA needs header.

I realize you might be a noob to RX's, But do read the FAQ for the model and then search for the mods in the archives. Can be a pain sometimes but that's where you learn about your RX. Go to Advanced Search and type RB headers, Downpipe...etc. You'd see quite a few threads on the subject.

Just to remind you there are those that might not be so gentle informing you to do so.

cool_as_crap

you should consider reading up on your own information there.
there is an n/a dp available from racing beat that bolts to the exhaust manifold: http://www.racingbeat.com/resultset....tNumber=S16206

i would go with the dp isntead of header, just because i live in CA and a header would be easily recognized as illegal. also, according to their site, the dp is quieter with similar performance gains.

ErixHvn

My Bad. Sorry.


Thanks Cool_as_crap. Had no idea about the NA downpipe. Always thought that they only had the headers for NA's.

Good thing I didn't outright flame the guy, Just to put my foot in my mouth.

speed_monkey

How can the dp have similar gains? Have you seriously looked at the stock exhaust manifold? It's basically a POS lol

I had a RB header/presilencer and I noticed a gain over my stock manifold/downpipe. I only sold it because I am putting a s5 TII block in. :p

HOZZMANRX7

iTrader: (43)

What LittleCon said is dead on. I actually had them talk me out of buying a header and just go with their downpipe/presilencer set up. Those with Auto Verts, they now offer that package for your car as well. And, lets face it, Auto RX7's and especially AutoVerts need all the help they can get. Put one on my Auto Vert and realized a bonus of very improved gas mileage.

And, to be clear, it isn't a downpipe per se that runs from the stock exhaust (or header) to the Y-pipe Racing Beat sells. It's the downpipe and presilencer that "cool" was refering to.

ErixHvn

I was very skeptical about that myself, I guess that it eliminates the catalytic converters' restriction but be simlar gain to the headers, Really?

But then again I might just have to eat my words one more time.

LittleCon

save your money, go with the downpipe / prescilencer

LISTIN TO HOZZMANRX7 lol

speed_monkey

mmk... Have you actually owned both combinations?

HOZZMANRX7

iTrader: (43)

To be clear, Racing Beat advised me that their own dyno tests for a STOCK na presented little difference in results between their downpipe/presilencer and their header/downpipe/presilencer set ups.

Considering their technical expertise, it's difficult to argue despite the cosmetics of the stock manifold. I will say the seat of the pants improvement in performance makes it well worth it, especially in my AutoVert.

speed_monkey

Dyno only tests WOT, it shows nothing how the car would behave around town and at low rpms. With the header I picked up quite a bit of low/mid range.

I find it funny how people always knock something, even though they have never even tried it.

spot_skater

I've owned both. At one time I had the downpipe/presilencer combo, to a stock y-pipe and mufflers. The gains over the stock exhaust system were very noticable. The butt-dyno said around 15-20 whp. VERY noticable gains in 3rd and 4th gear pulls on the highway, upper midrange/top end gain was extremely noticable.

Months later I bought a collected header, ditched the downpipe, and some point in between that time I wound up with a RB cat back. The power felt relatively the same, but it was a little bit louder.

It's just more fun to say you've got a full exhaust system, to be honest.

HOZZMANRX7

iTrader: (43)

^^^^ Said one who tried it.

spot_skater

synesthete

When i was choosing stuff for my exhaust on my NA, talking to a few different people including racing beat this was the idea that i got.

You dont need a header unless you have a ported motor, or otherwise significantly modified injection (carb).

So for us trying to build street cars theres really no point in a header unless you like really loud exhaust.

adrock3217

Uh, ok. I guess the biggest power adder for an NA is totally useless for a street car. Have you ever HEARD a full Racing Beat exhaust? If you think its loud, then I suppose you hate EVERY other exhaust on the market, also, as it is the quietest available.

synesthete

Yes i have heard full racing beat exhaust though there are a few of them.

I have heard the collected header into a presilencer and it is very loud...

I have heard the true dual and it is still very loud...

If your trying to imply that a header is the biggest place to get power on a NA then you are totally off. Read the thread... Racing beat talks you out of getting a header because the advantages of it over the stock manifold only show up with modified injection which 95% of us dont have.

I know you must feel stupid for buying and telling everyone who asks about exhaust on this forum to get a header now, because racing beat has confirmed what some of us have been saying for some time.... Headers are for squeazing the last possible bit of power out of a heavily modified NA rx7... and dont expect much unless you are ported or carbed.

Headers have always been the last step in a FULLY upgraded exhaust for practically every car i can think of since ive been around.

adrock your posts make it sound like you gain more power from adding a header than from eliminating the stock catalytic converter+precats.... That is a load of bullshit to anyone who knows anything about the car or has ever looked at the stuff being removed up close.

If you want to prove me wrong go get a dyno with header+presilencer vs stock mani+dp.... you dont have one do you.... well racing beat does and guess what they said... no noticable difference.

I would gladly sacrifice 1-2 very top end hp to avoid the raspy blare that is a NA rotary with header.