Actually, that does look good without the spoiler! Best looking SX I've seen in a while.
Running without a dump valve is a bit of a gamble, some say it's fine, some say it's not.
I ran mine for 2 years with a mixture of both and the turbo eventually packed up... could have well been the original turbo though. I've ran my Pulsar turbo without a dump valve and even with the 360º bearing have reverted back to the dump valve... mainly because the compressor stall is pretty quiet and can't really be heard