| Technically so can the MSP's but pulling the engine is the more efficient method for 99% of the people doing it. If you don't have the money for both and are pulling the engine now do the manifolds now and piping later. If you plan on doing 2.5" inlets as well you will save yourself a lot of time and frustration doing those while the engine is out as well. The 2.5" IC piping install is a cake walk compared to manifolds and inlet piping. If your stock turbos aren't bad I wouldn't spend the money on 525s. Hell even if your stockers are bad I wouldn't go with the 525 kit(sport 500s). There are so many newer technology turbos with similar spool up and a lot more top end for just a couple hundred dollars more. Here is my car with stock turbos/motor/TB's/manifolds on 91 octane. The rest of the mods are in my profile.
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The piping can be installed with the engine still in the car - 
