ok just got a header for my 80 rx7 do I need to get a pre silencer or will it be to loud without one.
I am thinkin loud but oohh well lol

 

no, thru the rx7's complicated exhaust setup you'll still have the main cat and muffler. the pre cat wont make a big sound difference. what do you consider "too loud"?

 

my 80 does not have a cats just silencers then to the mufflers
to loud well if you cant talk to each other then it might be to loud lol
randy
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If you got the Racing Bleat header specific for the SA models, it will bolt up to the stock heat exchanger, which will help quiet it down. The mini-presilencer they sell that replaces the stock heat exchanger isn't as quiet as I would like. If you run a header directly to the stock muffler, it will be quite loud.

 

Also, if your car likes to pop quite a bit(like mine) the stock muffler will not put up with it for long. Without anything before the muffler absorbing some of that force caused by the pops, the muffler will probably explode eventually. I was running the stock mainfold, gutted cats and stock muffler. After a while, the stock muffler couldn't take it, and just plain exploded when it popped one time. It was pretty bad, the side of the muffler completely split, that whole side of the muffler had about an 8'' tall hole that opened up when the side split. It also exploded out and hit the heat shield, and I had to take a hammer to the heat shield to bend it off my tire so I could continue driving until I got a new muffler.

 

So, the stock heat exchanger provides a muffling effect...is it more or less than the RB pre-silencer? In other words, which is louder?

 

The mini-presilencer is a bit louder than the stock heat exchanger, but a full-length presilencer is as quiet or quieter, and adds a more pleasant, lower tone. The mini-presilencer is a bit raspy when you get on the gas.

 

OK some say yes to it and others say it dont matter hummmm.. now if I dont use it my muffler will blow up and if I do ?? it should be OK right

randy I guess its six on one hand and a 1/2 dozzen on the other lol

 

Backfiring (after the thermal reactor is replaced with a header) indicates a problem and is not normal. I wouldn't worry too much about blowing out your muffler.
Most thermal reactor equipped rotaries normally STOP backfiring after a header is installed.