good or bad idea?

 

This has been covered countless times.

It's fine in the sense that it won't hurt anything. However, it will limit boost pressure and throttle response.

 

if im running stock boost, it wouldnt matter then? and how bad and how does it affect throttle response?

 

also, what about open dp in the meantime? how does this affect things?

 

open dp could bend vavles, i think

 

gonna loose back pressure which in return u will loose bottom end power and ur car will run rich still wont really hurt anything just gonna get dizzy drivin like that

 

then whats the diff from open dp and straight pipe?

 

i dont know what he's talking about bending valves n shit. buy a 3" downpipe that youre happy with, along with a test pipe and ur good. of course, accompanied by a quality aftermarket exhaust.
stock exhaust is always a good idea, thats why manufacturers put it on there.
when you decide to upgrade, pick up a 3"downpipe, test pipe, and turbo elbow (replace gaskets as well). stock exhaust is just fine, but its one of the first things people with SR'd cars do to free up power.
your throttle response is affected in this way...there is less cubic inches for air to move out of on a stock exhaust, as well as more bends in it, so you wont "feel" the cars power as well as you would with an aftermarket exhaust. its a considerable amount that you'll feel if you ask me, generally 8-15hp depending on the application. downpipe alone usually free's up to 12whp as stated by certain companies.

 

open DP is fine, all it will do is make more power and have quicker boost response. No downside besides being loud.

 

what do silvias usually come with from the factory?