Boosted stock FA20
 

Im planing on running force induction.. 7-8 psi and was wondering what size diameter should I use on my exhaust

Is the wastegate venting to atmosphere or recirculating into the exhaust?

This is subjective. I made 330whp on stock exhaust. You can use whatever you want, but you'll make more power with a larger diameter

I was thinking atmosphere because I read thats how you get the “pingeon” noise but really what would be ideal?

The wastegate re-routes exhaust gas and doesn't have anything to do with the noise you're describing. You're talking about the blow-off valve recirculating or being vented to atmosphere.

I would spend a couple weeks researching the components of a turbo system. They are almost all the same, and you'll learn a lot by reading and watching explanation videos. Once you have a better understanding, you'll be able to answer more questions for yourself.

An external wastegate that vents to atmosphere is best for making power, but is very loud. Much louder than you're thinking after reading that.

Her a recirculated dump. Honestly after a while loud noise gets exhausting. Hearing a bov and catback purring is all you need. Sometimes I think people drive cars just to do pulls.

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Oh yea definitely, I know nothing about force induction and just started researching this week but mostly focused on my engine limits and components. Now im starting to get to know the turbo, and should back pressure be something to worry about? I mean im not gonna be time attacking anytime soon so should I spend time learning about it or?

If you are new to the car scene spend time learning your car. You mention time attacking, do you plan to track the car at all? Really, you should be finding a tuner you are going to work with and start discussing your goals with them.

I wouldn't focus on your car specifically, I would do an overall search for anything related to understand how a turbo system works. Learn the names of the parts involved to de-mystify them; you'll find a lot of things are named differently but perform the same function. Two of the biggest offenders are overpipe, up-pipe, j-pipe, downpipe, front-pipe, side pipe, etc. These will be vehicle specific, but are ALWAYS referring to a section of the exhaust, it's just a matter of understanding what section specifically they are referring to. They're commonly named in association with their shape. We have an overpipe, for example. This goes OVER a portion of the subframe.

Another commonly confusing one is a Blow off valve, or bypass valve, or recirc valve. The word to look for is VALVE, and it is just diverting air that doesn't enter the engine when you let off the gas.
Imagine you're filling a balloon with water. The balloon is your engine, and when you let off the gas pedal, you're essentially tying the knot of the end of the balloon so no more water gets in. That hose is still filled with water, right? So the blow off valve would effectively be something that diverts the water from entering the balloon.
A recirculating blow-off valve recirculates the air back into the intake so it's not wasted. A "bypass valve" does the exact same thing. a blow off valve however typically just lets it shoot off into wherever, which makes the most noise. To keep with the analogy I gave, a recirc valve would be re-directing wasted water back into the hose for the next balloon. A blow off valve would just let the water go onto the ground.

I apologize if this is making things more confusing, but you're going to find that the more you learn, you'll see that there's so much more you don't know (and need to know).
Researching all the components of the turbo system will be a great weekend project. After that, start learning how an engine functions- learn the components and how what you do affects them (A great example is learning what the clutch pedal in your car actually does! Not just that it makes it so you can change gears). The more you understand about the entire mechanical assembly of something, the more you can understand when it does or does not need to be upgraded or changed based on a goal or inquisition you have about replacing it.


My last piece- The wastegate works exactly like the blow-off valve. It diverts exhaust away from the turbo to control the boost you're making (It directly controls your boost level) and with the wasted exhaust, you can either have it just dumping the extra exhaust gas towards the ground below or to the side of the car, or it can be recirculated into the exhaust.
If you're re-routing a ton of wasted exhaust gas BACK into the exhaust, that's when you'll get a lot of backpressure and need a super free-flowing exhaust. If you're dumping it into the atmosphere, you do not need such an open exhaust system.

Damn that was great!! I actually understood, you made a great example for it. I guess I’ll start learning more about turbos and all that so I know what to expect out of the kit I choose to have. Thanks a lot guys!!